REVIEW Open Access
International Society of Sports Nutrition
position stand: safety and efficacy of
creatine supplementation in exercise, sport,
and medicine
Richard B. Kreider1*
, Douglas S. Kalman2
, Jose Antonio3
, Tim N. Ziegenfuss4
, Robert Wildman5
, Rick Collins6
,
Darren G. Candow7
, Susan M. Kleiner8
, Anthony L. Almada9
and Hector L. Lopez4,10
Abstract
Creatine is one of the most popular nutritional ergogenic aids for athletes. Studies have consistently shown that creatine
supplementation increases intramuscular creatine concentrations which may help explain the observed improvements
in high intensity exercise performance leading to greater training adaptations. In addition to athletic and exercise
improvement, research has shown that creatine supplementation may enhance post-exercise recovery, injury prevention,
thermoregulation, rehabilitation, and concussion and/or spinal cord neuroprotection. Additionally, a number of clinical
applications of creatine supplementation have been studied involving neurodegenerative diseases (e.g., muscular
dystrophy, Parkinson’s, Huntington’s disease), diabetes, osteoarthritis, fibromyalgia, aging, brain and heart ischemia,
adolescent depression, and pregnancy. These studies provide a large body of evidence that creatine can not only
improve exercise performance, but can play a role in preventing and/or reducing the severity of injury, enhancing
rehabilitation from injuries, and helping athletes tolerate heavy training loads. Additionally, researchers have identified a
number of potentially beneficial clinical uses of creatine supplementation. These studies show that short and long-term
supplementation (up to 30 g/day for 5 years) is safe and well-tolerated in healthy individuals and in a number of patient
populations ranging from infants to the elderly. Moreover, significant health benefits may be provided by ensuring
habitual low dietary creatine ingestion (e.g., 3 g/day) throughout the lifespan. The purpose of this review is to provide an
update to the current literature regarding the role and safety of creatine supplementation in exercise, sport, and medicine
and to update the position stand of International Society of Sports Nutrition (ISSN).
Keywords: Ergogenic aids, Performance enhancement, Sport nutrition, Athletes, Muscular strength, Muscle power, Clinical
applications, Safety, Children, Adolescents
Background
Creatine is one of the most popular nutritional ergogenic
aids for athletes. Studies have consistently shown that
creatine supplementation increases intramuscular creatine
concentrations, can improve exercise performance, and/or
improve training adaptations. Research has indicated that
creatine supplementation may enhance post-exercise recovery,
injury prevention, thermoregulation, rehabilitation, and
concussion and/or spinal cord neuroprotection. A number
of clinical applications of creatine supplementation have
also been studied involving neurodegenerative diseases
(e.g., muscular dystrophy, Parkinson’s, Huntington’s
disease), diabetes, osteoarthritis, fibromyalgia, aging, brain
and heart ischemia, adolescent depression, and pregnancy.
The purpose of this review is to provide an update to the
current literature regarding the role and safety of creatine
supplementation in exercise, sport, and medicine and to
update the position stand of International Society of Sports
Nutrition (ISSN) related to creatine supplementation.
* Correspondence: rbkreider@tamu.edu
1
Exercise & Sport Nutrition Lab, Human Clinical Research Facility, Department
of Health & Kinesiology, Texas A&M University, College Station, TX
77843-4243, USA
Full list of author information is available at the end of the article
© The Author(s). 2017 Open Access This article is distributed under the terms of the Creative Commons Attribution 4.0
International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and
reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to
the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver
(http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated.
Kreider et al. Journal of the International Society of Sports Nutrition (2017) 14:18
DOI 10.1186/s12970-017-0173-z
Metabolic role
Creatine, a member of the guanidine phosphagen family, is
a naturally occurring non-protein amino acid compound
found primarily in red meat and seafood [1–4]. The majority
of creatine is found in skeletal muscle (~95%) with small
amounts also found in the brain and testes (~5%) [5, 6].
About two thirds of intramuscular creatine is phosphocreatine
(PCr) with the remaining being free creatine. The total
creatine pool (PCr + Cr) in the muscle averages about
120 mmol/kg of dry muscle mass for a 70 kg individual [7].
However, the upper limit of creatine storage appears to be
about 160 mmol/kg of dry muscle mass in most individuals
[7, 8]. About 1–2% of intramuscular creatine is degraded
into creatinine (metabolic byproduct) and excreted in the
urine [7, 9, 10]. Therefore, the body needs to replenish
about 1–3 g of creatine per day to maintain normal
(unsupplemented) creatine stores depending on muscle
mass. About half of the daily need for creatine is obtained
from the diet [11]. For example, a pound of uncooked beef
and salmon provides about 1–2 g of creatine [9]. The
remaining amount of creatine is synthesized primarily in
the liver and kidneys from arginine and glycine by the
enzyme arginine:glycine amidinotransferase (AGAT) to
guanidinoacetate (GAA), which is then methylated by
guanidinoacetate N-methyltransferase (GAMT) using
S-adenosyl methionine to form creatine (see Fig. 1) [12].
Some individuals have been found to have creatine
synthesis deficiencies due to inborn errors in AGAT,
GMAT and/or creatine transporter (CRTR) deficiencies
and therefore must depend on dietary creatine intake in
order to maintain normal muscle and brain concentrations
of PCr and Cr [13–19]. Vegetarians have been
reported to have lower intramuscular creatine stores (90–
110 mmol/kg of dry muscle) and therefore may observe
greater gains in muscle creatine content from creatine
supplementation [11, 13, 20, 21]. Conversely, larger athletes
engaged in intense training may need to consume 5–
10 g/day of creatine to maintain optimal or capacity whole
body creatine stores [22] and clinical populations may
need to consume 10–30 g/day throughout their lifespan
to offset creatine synthesis deficiencies and/or provide
therapeutic benefit in various disease states [13, 19, 23].
Phosphagens are prevalent in all species and play an important
role in maintaining energy availability [1, 2, 24, 25].
The primary metabolic role of creatine is to combine with
a phosphoryl group (Pi) to form PCr through the enzymatic
reaction of creatine kinase (CK). Wallimann and colleagues
[26–28] suggested that the pleiotropic effects of Cr
are mostly related to the functions of CK and PCr (i.e.,
CK/PCr system). As adenosine triphosphate (ATP) is degraded
into adenosine diphosphate (ADP) and Pi to provide
free energy for metabolic activity, the free energy
released from the hydrolysis of PCr into Cr + Pi can be
used as a buffer to resynthesize ATP [24, 25]. This helps
maintain ATP availability particularly during maximal effort
anaerobic sprint-type exercise. The CK/PCr system
also plays an important role in shuttling intracellular energy
from the mitochondria into the cytosol (see Fig. 2).
The CK/PCr energy shuttle connects sites of ATP production
(glycolysis and mitochondrial oxidative phosphorylation)
with subcellular sites of ATP utilization (ATPases)
[24, 25, 27]. In this regard, creatine enters the cytosol
through a CRTR [16, 29–31]. In the cytosol, creatine and
associated cytosolic and glycolytic CK isoforms help
Fig. 1 Chemical structure and biochemical pathway for creatine synthesis. From Kreider and Jung [6]
Kreider et al. Journal of the International Society of Sports Nutrition (2017) 14:18 Page 2 of 18
Fig. 2 Proposed creatine kinase/phosphocreatine (CK/PCr) energy shuttle. CRT = creatine transporter; ANT = adenine nucleotide translocator; ATP =
adenine triphosphate; ADP = adenine diphosphate; OP = oxidative phosphorylation; mtCK = mitochondrial creatine kinase; G = glycolysis; CK-g =
creatine kinase associated with glycolytic enzymes; CK-c = cytosolic creatine kinase; CK-a = creatine kinase associated with subcellular sites of ATP
utilization; 1 – 4 sites of CK/ATP interaction. From Kreider and Jung [6]
Fig. 3 Role of mitochondrial creatine kinase (mtCK) in high energy metabolite transport and cellular respiration. VDAC = voltage-dependent anion
channel; ROS = reactive oxygen species; RNS = reactive nitrogen species; ANT = adenine nucleotide translocator; ATP = adenine triphosphate; ADP
= adenine diphosphate; Cr = creatine; and, PCr = phosphocreatine. From Kreider and Jung [6]
Kreider et al. Journal of the International Society of Sports Nutrition (2017) 14:18 Page 3 of 18
maintain glycolytic ATP levels, the cytosolic ATP/ADP ratio,
and cytosolic ATP-consumption [27]. Additionally, creatine
diffuses into the mitochondria and couples with ATP
produced from oxidative phosphorylation and the adenine
nucleotide translocator (ANT) via mitochondrial CK (see
Fig. 3). ATP and PCr can then diffuse back into the cytosol
and help buffer energy needs. This coupling also reduces
the formation of reactive oxygen species (ROS) and can
therefore act as a direct and/or indirect antioxidant [32–
35]. The CK/PCr energy shuttle thereby connects sites of
ATP production (glycolysis and mitochondrial oxidative
phosphorylation) with subcellular sites of ATP utilization
(ATPases) in order to fuel energy metabolism [24, 25, 27].
In this way, the CK/PCr system thereby serves as an
important regulator of metabolism which may help explain
the ergogenic and potential therapeutic health benefits of
creatine supplementation [4, 27, 33, 36–45].
Supplementation protocols
In a normal diet that contains 1–2 g/day of creatine,
muscle creatine stores are about 60–80% saturated.
Therefore, dietary supplementation of creatine serves to
increase muscle creatine and PCr by 20–40% (see Fig. 4.)
[7, 8, 10, 46–48]. The most effective way to increase
muscle creatine stores is to ingest 5 g of creatine monohydrate
(or approximately 0.3 g/kg body weight) four
times daily for 5–7 days [7, 10]. However, higher levels
of creatine supplementation for longer periods of time
may be needed to increase brain concentrations of creatine,
offset creatine synthesis deficiencies, or influence
disease states [13, 19, 23]. Once muscle creatine stores
are fully saturated, creatine stores can generally be maintained
by ingesting 3–5 g/day, although some studies
indicate that larger athletes may need to ingest as much
as 5–10 g/day in order to maintain creatine stores [7, 8, 10,
46–48]. Ingesting creatine with carbohydrate or carbohydrate
and protein have been reported to more consistently promote
greater creatine retention [8, 22, 49, 50]. An alternative
supplementation protocol is to ingest 3 g/day of creatine
monohydrate for 28 days [7]. However, this method
would only result in a gradual increase in muscle
creatine content compared to the more rapid loading
method and may therefore have less effect on exercise
performance and/or training adaptations until creatine
stores are fully saturated. Research has shown that
once creatine stores in the muscle are elevated, it
generally takes 4–6 weeks for creatine stores to return
to baseline [7, 48, 51]. Additionally, it has been
recommended that due to the health benefits of
creatine, individuals should consume about 3 g/day of
creatine in their diet particularly as one ages [27]. No
evidence has suggested that muscle creatine levels fall
below baseline after cessation of creatine supplementation;
therefore, the potential for long-term suppression
of endogenous creatine synthesis does not appear
to occur [22, 52].
Bioavailability
The most commonly studied form of creatine in the
literature is creatine monohydrate [53]. The uptake of
creatine involves the absorption of creatine into the
blood and then uptake by the target tissue [53]. Plasma
levels of creatine typically peak at about 60 min after
oral ingestion of creatine monohydrate [7]. An initial rise
in plasma creatine levels, followed by a reduction in
plasma levels can be used to indirectly suggest increased
uptake into the target tissue [53]. However, the gold
standards for measuring the effects of creatine supplementation
on target tissues are through magnetic resonance
spectroscopy (MRS), muscle biopsy, stable isotope tracer
studies, and/or whole body creatine retention assessed by
Fig. 4 Approximate muscle total creatine levels in mmol/kg dry weight muscle reported in the literature for vegetarians, individuals following a
normal diet, and in response to creatine loading with or without carbohydrate (CHO) or CHO and protein (PRO). From Kreider and Jung [6]
Kreider et al. Journal of the International Society of Sports Nutrition (2017) 14:18 Page 4 of 18
measuring the difference between creatine intake and urinary
excretion of creatine [53].
Creatine is stable in solid form but not in aqueous solution
due to an intramolecular cyclization [54]. Generally,
creatine is converted to creatinine at higher rates
the lower the pH and the higher the temperature. For
example, research has shown that creatine is relatively
stable in solution at neutral pH (7.5 or 6.5). However,
after 3 days of storage at 25 °C, creatine degrades to creatinine
(e.g., 4% at pH 5.5; 12% at pH 4.5; and 21% at
pH 3.5) [53, 55]. The degradation of creatine into creatinine
over time is the main reason that creatine is sold
in solid form. However, this does not mean that creatine
is degraded into creatinine in vivo through the digestive
process. In this regard, the degradation of creatine to
creatinine can be reduced or halted be either lowering
the pH under 2.5 or increasing the pH [53]. A very low
pH results in the protonation of the amide function of
the creatine molecule, thereby preventing the intramolecular
cyclization [53]. Therefore, the conversion of
creatine to creatinine in the gastrointestinal tract is minimal
regardless of transit time; absorption into the blood
is nearly 100% [10, 53, 56, 57].
The vast majority of studies assessing the efficacy of
creatine supplementation on muscle phosphagen levels,
whole body creatine retention, and/or performance have
evaluated creatine monohydrate. Claims that different
forms of creatine are degraded to a lesser degree than
creatine monohydrate in vivo or result in a greater uptake
to muscle are currently unfounded [53]. Clinical
evidence has not demonstrated that different forms of
creatine such as creatine citrate [50], creatine serum
[58], creatine ethyl ester [59], buffered forms of creatine
[60], or creatine nitrate [61] promote greater creatine retention
than creatine monohydrate [53].
Ergogenic value
Table 1 presents the reported ergogenic benefits of
creatine supplementation. A large body of evidence
now indicates that creatine supplementation increases
muscle availability of creatine and PCr and can therefore
enhance acute exercise capacity and training
adaptations in adolescents [62–66], younger adults
[61, 67–77] and older individuals [5, 40, 43, 78–85].
These adaptations would allow an athlete to do more
work over a series of sets or sprints leading to greater
gains in strength, muscle mass, and/or performance
due to an improvement in the quality of training.
Table 2 presents the types of sport events in which
creatine supplementation has been reported to benefit.
Creatine supplementation has primarily been recommended
as an ergogenic aid for power/strength
athletes to help them optimize training adaptations or
athletes who need to sprint intermittently and recover
during competition (e.g., American football, soccer,
basketball, tennis, etc.). After creatine loading, performance
of high intensity and/or repetitive exercise
is generally increased by 10–20% depending on the
magnitude of increase in muscle PCr [46].
Benefits have been reported in men and women, although
the majority of studies have been conducted on
men and some studies suggest that women may not
see as much gain in strength and/or muscle mass
during training in response to creatine supplementation
[20, 51, 64, 86–90]. However, as will be described
below, a number of other applications in
Table 1 Potential ergogenic benefits of creatine
supplementation
• Increased single and repetitive sprint performance
• Increased work performed during sets of maximal effort muscle
contractions
• Increased muscle mass & strength adaptations during training
• Enhanced glycogen synthesis
• Increased anaerobic threshold
• Possible enhancement of aerobic capacity via greater shuttling
of ATP from mitochondria
• Increased work capacity
• Enhanced recovery
• Greater training tolerance
Adapted from Kreider and Jung [6]
Table 2 Examples of sport events that may be enhanced by
creatine supplementation
Increased PCr
• Track sprints: 60–200 m
• Swim sprints: 50 m
• Pursuit cycling
Increased PCr Resynthesis
• Basketball
• Field hockey
• America Football
• Ice hockey
• Lacrosse
• Volleyball
Reduced Muscle Acidosis
• Downhill skiing
• Water Sports (e.g., Rowing, Canoe, Kayak, Stand-Up Paddling)
• Swim events: 100, 200 m
• Track events: 400, 800 m
• Combat Sports (e.g., MMA, Wrestling, Boxing, etc.)
Oxidative Metabolism
• Basketball
• Soccer
• Team handball
• Tennis
• Volleyball
• Interval Training in Endurance Athletes
Increased Body Mass/Muscle Mass
• American Football
• Bodybuilding
• Combat Sports (e.g., MMA, Wrestling, Boxing, etc.)
• Powerlifting
• Rugby
• Track/Field events (Shot put; javelin; discus; hammer throw)
• Olympic Weightlifting
Adapted from Williams, Kreider, and Branch [269]
Kreider et al. Journal of the International Society of Sports Nutrition (2017) 14:18 Page 5 of 18
sport may benefit athletes involved in high intensity
intermittent and endurance events as well. In terms
of performance, the International Society of Sports
Nutrition (ISSN) has previously concluded in its position
stand on creatine supplementation that creatine
monohydrate is the most effective ergogenic nutritional
supplement currently available to athletes in
terms of increasing high-intensity exercise capacity
and lean body mass during training [5, 78]. Recent
position stands by the American Dietetic Association,
Dietitians of Canada, and the American College of
Sports Medicine on nutrition for athletic performance
all drew similar conclusions [91, 92]. Thus, a widespread
consensus now exists in the scientific community
that creatine supplementation can serve as an effective
nutritional ergogenic aid that may benefit
athletes involved in numerous sports as well as individuals
involved in exercise training.
Prevalence of use in sport
Creatine is found in high amounts in the food supply
and therefore its use is not banned by any sport
organization although some organizations prohibit
provision of some types of dietary supplements to athletes
by their teams [5, 53, 78, 91, 92]. In these instances,
athletes can purchase and use creatine on their own
without penalty or violation of their banned substance
restrictions. Americans consume over four million kilograms
(kg) a year of creatine with worldwide use much
higher [53]. The reported prevalence of creatine use
among athletes and military personnel in survey-based
studies has generally been reported to be about 15–40%
[93–101], with use more common in male strength/
power athletes. High school athletes have been reported
to have similar prevalence of use of creatine [95–97, 102].
In 2014, the NCAA reported that creatine was among the
most popular dietary supplements taken by their male
athletes (e.g., baseball - 28.1%, basketball - 14.6%,
football - 27.5%, golf - 13.0%, ice hockey - 29.4%,
lacrosse - 25.3%, soccer 11.1%, swimming - 19.2%,
tennis - 12.9%, track and field - 16.1%, wrestling - 28.5%)
while female athletes reported a use rate of only 0.2 to
3.8% in various sports [103]. Comparatively, these NCAA
athletes reported relatively high alcohol (83%), tobacco
(10–16%), and marijuana (22%) use along with minimal
androgenic anabolic steroid use (0.4%). As will be noted
below, no study has reported any adverse or ergolytic
effect of short- or long-term creatine supplementation
while numerous studies have reported performance
and/or health benefits in athletes and individuals with
various diseases. Therefore, the prevalence of alcohol,
tobacco and drug use among NCAA athletes would
seemingly be a much greater health concern than athletes
taking creatine.
Other applications in sport and training
Recent research demonstrates a number of other applications
of creatine supplementation that may benefit
athletes involved in intense training and individuals who
want to enhance training adaptations. For example, use
of creatine during training may enhance recovery, reduce
the risk of injury and/or help individuals recover
from injuries at a faster rate. The following describes
some applications of creatine in addition to serving as
an ergogenic aid.
Enhanced recovery
Creatine supplementation can help athletes recover from
intense training. For example, Green and coworkers [8]
reported that co-ingesting creatine (5 g) with large
amounts of glucose (95 g) enhanced creatine and carbohydrate
storage in muscle. Additionally, Steenge et al.
[49] reported that co-ingesting creatine (5 g) with 47–
97 g of carbohydrate and 50 g of protein enhanced creatine
retention. Nelson and colleagues [104] reported that
creatine loading prior to performing an exhaustive exercise
bout and glycogen loading promoted greater glycogen
restoration than just carbohydrate loading alone.
Since glycogen replenishment is important to promoting
recovery and preventing overtraining during intensified
training periods [78], creatine supplementation may help
athletes who deplete large amounts of glycogen during
training and/or performance to maintain optimal glycogen
levels.
Evidence also suggests that creatine supplementation
may reduce muscle damage and/or enhance recovery
from intense exercise. For example, Cooke and associates
[105] evaluated the effects of creatine supplementation
on muscle force recovery and muscle damage
following intense exercise. They reported that participants
supplemented with creatine had significantly
greater isokinetic (+10%) and isometric (+21%) knee extension
strength during recovery from exercise-induced
muscle damage. Additionally, plasma CK levels were significantly
lower (−84%) after 2, 3, 4, and 7 days of recovery
in the creatine supplemented group compared to
controls. The authors concluded that creatine improved
the rate of recovery of knee extensor muscle function
after injury. Santos and coworkers [106] evaluated the
effects of creatine loading in experienced marathon runners
prior to performing a 30 km race on inflammatory
markers and muscle soreness. The researchers reported
that creatine loading attenuated the changes in CK
(−19%), prostaglandin E2 (−61%), and tumor necrosis
factor (TNF) alpha (−34%) and abolished the increase in
lactate dehydrogenase (LDH) compared to controls.
Similar findings were reported by Demince et al. [107]
who reported that creatine supplementation inhibited
the increase of inflammatory markers (TNF-alpha and
Kreider et al. Journal of the International Society of Sports Nutrition (2017) 14:18 Page 6 of 18
C-reactive protein) in response to intermittent anaerobic
sprint exercise. Finally, Volek and colleagues [77] evaluated
the effects of creatine supplementation (0.3 g/
kg/d) for 4 weeks during an intensified overreaching
period followed by a 2 weeks taper. The researchers
found that creatine supplementation was effective in
maintaining muscular performance during the initial
phase of high-volume resistance training overreaching
that otherwise results in small performance decrements.
These findings suggest that creatine supplementation
can help athletes tolerate heavy increases
in training volume. Therefore, there is strong evidence
that creatine supplementation can help athletes
enhance glycogen loading; experience less inflammation
and/or muscle enzyme efflux following intense
exercise; and tolerate high volumes of training and/or
overreaching to a greater degree thereby promoting
recovery.
Injury prevention
Several studies have reported that creatine supplementation
during training and/or competition either has no effect
or reduces the incidence of musculoskeletal injury,
dehydration, and/or muscle cramping. For example, several
initial studies on creatine supplementation provided
15–25 g/day of creatine monohydrate for 4 – 12 weeks
in athletes engaged in heavy training with no reported
side effects [67, 77, 108–110]. Kreider and colleagues
[109] reported that American collegiate football players
ingesting 20 or 25 g/day of creatine monohydrate with a
carbohydrate/protein supplement for 12 weeks during
off season conditioning and spring football practice experienced
greater gains in strength and muscle mass
with no evidence of any adverse side effects. Additionally,
in a study specifically designed to assess the safety
of creatine supplementation, American collegiate football
players ingesting about 16 g/day of creatine for 5
days and 5–10 g/day for 21 months had no clinically significant
differences among creatine users and controls in
markers of renal function, muscle and liver enzymes,
markers of catabolism, electrolytes, blood lipids, red cell
status, lymphocytes, urine volume, clinical urinalysis, or
urine specific gravity [22]. Meanwhile, creatine users
experienced less incidence of cramping, heat illness/dehydration,
muscle tightness, muscle strains/pulls, noncontact
injuries, and total injuries/missed practices than
those not taking creatine [111].
Similar findings were reported by Greenwood and coworkers
[112] who examined injury rates during a 4
months American collegiate football season among creatine
users (0.3 g/kg/day for 5 days, 0.03 g/kg/day for 4
months) and non-users. The researchers reported that
creatine users experienced significantly less incidence of
muscle cramping, heat illness/dehydration, muscle
tightness, muscle strains, and total injuries compared to
athletes who did not supplement their diet with creatine.
Likewise, Cancela and associates [113] reported that creatine
supplementation (15 g/day x 7-d, 3 g/day x 49-d)
during soccer training promoted weight gain but that
those taking creating had no negative effects on blood
and urinary clinical health markers. Finally, Schroder et
al. [114] evaluated the effects of ingesting creatine (5 g/
day) for three competitive seasons in professional basketball
players. The researchers found that long-term
low-dose creatine monohydrate supplementation did not
promote clinically significant changes in health markers
or side effects. Thus, contrary to unsubstantiated reports,
the peer-reviewed literature demonstrates that
there is no evidence that: 1) creatine supplementation increases
the anecdotally reported incidence of musculoskeletal
injuries, dehydration, muscle cramping,
gastrointestinal upset, renal dysfunction, etc.; or that 2)
long-term creatine supplementation results in any clinically
significant side effects among athletes during training
or competition for up to 3 years. If anything,
evidence reveals that athletes who take creatine during
training and competition experience a lower incidence
of injuries compared to athletes who do not supplement
their diet with creatine.
Enhanced tolerance to exercise in the heat
Like carbohydrate, creatine monohydrate has osmotic
properties that help retain a small amount of water. For
example, initial studies reported that creatine loading
promoted a short-term fluid retention (e.g., about 0.5 –
1.0 L) that was generally proportional to the acute
weight gain observed [22, 46]. For this reason, there was
interest in determining if creatine supplementation may
help hyper-hydrate an athlete and/or improve exercise
tolerance when exercising in the heat [76, 115–126]. For
example, Volek and colleagues [76] evaluated the effects
of creatine supplementation (0.3 g/kg/day for 7 days) on
acute cardiovascular, renal, temperature, and fluidregulatory
hormonal responses to exercise for 35 min in
the heat. The researchers reported that creatine supplementation
augmented repeated sprint cycle performance
in the heat without altering thermoregulatory responses.
Kilduff and associates [123] evaluated the effects of creatine
supplementation (20 g/day for 7 days) prior to performing
exercise to exhaustion at 63% of peak oxygen
uptake in the heat (30.3 °C). The researchers reported
that creatine supplementation increased intracellular
water and reduced thermoregulatory and cardiovascular
responses to prolonged exercise (e.g., heart rate,
rectal temperature, sweat rate) thereby promoting
hyper-hydration and a more efficient thermoregulatory
response during prolonged exercise in the heat. Watson
and colleagues [117] reported that short-term
Kreider et al. Journal of the International Society of Sports Nutrition (2017) 14:18 Page 7 of 18
creatine supplementation (21.6 g/day for 7 days) did
not increase the incidence of symptoms or compromise
hydration status or thermoregulation in dehydrated
(−2%), trained men exercising in the heat.
Similar findings were observed by several other
groups [118, 119, 127, 128] leading researchers to add
creatine to glycerol as a highly effective hyperhydrating
strategy to help athletes better tolerate exercise
in the heat [116, 120–122, 125, 126]. These
findings provide strong evidence that creatine supplementation
(with or without glycerol) may serve as an effective
nutritional hyper-hydration strategy for athletes engaged
in intense exercise in hot and humid environments
thereby reducing risk to heat related-illness [5, 129].
Enhanced rehabilitation from injury
Since creatine supplementation has been reported to
promote gains in muscle mass and improved strength,
there has been interest in examining the effects of creatine
supplementation on muscle atrophy rates as a result
of limb immobilization and/or during rehabilitation
[130]. For example, Hespel and coworkers [131] examined
the effects of creatine supplementation (20 g/day
down to 5 g/day) on atrophy rates and rehabilitation
outcomes in individuals who had their right leg casted
for 2 weeks. During the 10 week rehabilitation phase,
participants performed three sessions a week of knee extension
rehabilitation. The researchers reported that individuals
in the creatine group experienced greater
changes in the cross-sectional area of muscle fiber
(+10%) and peak strength (+25%) during the rehabilitation
period. These changes were associated with greater
changes in myogenic regulating factor 4 (MRF4) and
myogenic protein expression. In a companion paper to
this study, Op’t Eijnde et al. [132] reported that creatine
supplementation offset the decline in muscle GLUT4
protein content that occurs during immobilization and
increased GLUT4 protein content during subsequent rehabilitation
training in healthy subjects. Collectively,
these findings suggest that creatine supplementation
lessened the amount of muscle atrophy and detrimental
effects on muscle associated with immobilization while
promoting greater gains in strength during rehabilitation.
Similarly, Jacobs and associates [133] examined the
effects of creatine supplementation (20 g/d for 7 days)
on upper extremity work capacity in individuals with
cervical-level spinal cord injury (SCI). Results revealed
that peak oxygen uptake and ventilatory anaerobic
threshold were increased following creatine supplementation.
Conversely, Tyler et al. [134] reported that creatine
supplementation (20 g/day for 7 days, and 5 g/day
thereafter) did not significantly affect strength or functional
capacity in patients recovering from anterior cruciate
ligament (ACL) surgery. Moreover, Perret and
colleagues [135] reported that creatine supplementation
(20 g/day for 6 days) did not enhance 800 m wheelchair
performance in trained SCI wheelchair athletes. While
not all studies show benefit, there is evidence that creatine
supplementation may help lessen muscle atrophy following
immobilization and promote recovery during
exercise-related rehabilitation in some populations.
Thus, creatine supplementation may help athletes and
individuals with clinical conditions recover from injuries.
Brain and spinal cord neuroprotection
The risk of concussions and/or SCI in athletes involved
in contact sports has become an international concern
among sports organizations and the public. It has been
known for a long time that creatine supplementation
possesses neuroprotective benefits [29, 38, 40, 136]. For
this reason, a number of studies have examined the effects
of creatine supplementation on traumatic brain injury
(TBI), cerebral ischemia, and SCI. For example,
Sullivan et al. [137] examined the effects of 5 days of
creatine administration prior to a controlled TBI in rats
and mice. The researchers found that creatine monohydrate
ameliorated the extent of cortical damage by 36 to
50%. The protection appeared to be related to creatineinduced
maintenance of neuronal mitochondrial bioenergetics.
Therefore, the researchers concluded that
creatine supplementation may be useful as a neuroprotective
agent against acute and chronic neurodegenerative
processes. In a similar study, Haussmann and
associates [138] investigated the effects of rats fed creatine
(5 g/100 g dry food) before and after a moderate
SCI. The researchers reported that creatine ingestion improved
locomotor function tests and reduced the size of
scar tissue after the SCI. The authors suggested that pretreatment
of patients with creatine may provide neuroprotection
in patients undergoing spinal surgery who are
at risk to SCI. Similarly, Prass and colleagues [139] reported
findings that creatine administration reduced
brain infarct size following an ischemic event by 40%.
Adcock et al. [140] reported that neonatal rats fed 3 g/
kg of creatine for 3 days observed a significant increase
in the ratio of brain PCr to Pi and a 25% reduction in
the volume of edemic brain tissue following cerebral
hypoxic ischemia. The authors concluded that creatine
supplementation appears to improve brain bioenergetics
thereby helping minimize the impact of brain ischemia.
Similarly, Zhu and colleagues [141] reported that oral
creatine administration resulted in a marked reduction
in ischemic brain infarction size, neuronal cell death,
and provided neuroprotection after cerebral ischemia in
mice. The authors suggested that given the safety record
of creatine, creatine might be considered as a novel
therapeutic agent for inhibition of ischemic brain injury
in humans. Allah et al. [142] reported that creatine
Kreider et al. Journal of the International Society of Sports Nutrition (2017) 14:18 Page 8 of 18
monohydrate supplementation for 10 weeks reduced the
infarction size and improved learning/memory following
neonatal hypoxia ischemia encephalopathy in female
mice. The authors concluded that creatine supplementation
has the potential to improve the neuro-function following
neonatal brain damage. Finally, Rabchevsky and
associates [143] examined the efficacy of creatinesupplemented
diets on hind limb functional recovery
and tissue sparing in adult rats. Rats were fed a control
diet or 2% creatine-supplemented chow for 4–5 weeks
prior to and following SCI. Results revealed that creatine
feeding significantly reduced loss of gray matter after
SCI. These findings provide strong evidence that creatine
supplementation may limit damage from concussions,
TBI, and/or SCI [33, 144].
Potential medical uses of creatine
Given the role of creatine in metabolism, performance,
and training adaptations; a number of researchers have
been investigating the potential therapeutic benefits of
creatine supplementation in various clinical populations.
The following highlights some of these applications.
Creatine synthesis deficiencies
Creatine deficiency syndromes are a group of inborn errors
(e.g., AGAT deficiency, GAMT deficiency, and
CRTR deficiency) that reduce or eliminate the ability to
endogenously synthesize or effect transcellular creatine
transport [17]. Individuals with creatine synthesis deficiencies
have low levels of creatine and PCr in the
muscle and the brain. As a result, they often have clinical
manifestations of muscle myopathies, gyrate atrophy,
movement disorders, speech delay, autism, mental
retardation, epilepsy, and/or developmental problems
[13, 17, 145]. For this reason, a number of studies have investigated
the use of relatively high doses of creatine monohydrate
supplementation (e.g., 0.3 – 0.8 g/kg/day equivalent
to 21 – 56 g/day of creatine for a 70 kg person, or 1 – 2.7
times greater than the adult loading dose) throughout the
lifespan as a means of treating children and adults with creatine
synthesis deficiencies [13, 17, 145–149]. These studies
generally show some improvement in clinical outcomes
particularly for AGAT and GAMT with less consistent effects
on CRTR deficiencies [145].
For example, Battini et al. [150] reported that a patient
diagnosed at birth with AGAT deficiency who was
treated with creatine supplementation beginning at 4
months of age experienced normal psychomotor development
at 18 months compared to siblings who did not
have the deficiency. Stockler-Ipsiroglu and coworkers
[151] evaluated the effects of creatine monohydrate supplementation
(0.3 – 0.8 g/kg/day) in 48 children with
GMAT deficiency with clinical manifestations of global
developmental delay/intellectual disability (DD/ID) with
speech/language delay and behavioral problems (n = 44),
epilepsy (n = 35), or movement disorder (n = 13). The
median age at treatment was 25.5 months, 39 months,
and 11 years in patients with mild, moderate, and severe
DD/ID, respectively. The researchers found that creatine
supplementation increased brain creatine levels and improved
or stabilized clinical symptoms. Moreover, four
patients treated younger than 9 months had normal or
almost normal developmental outcomes. Long-term creatine
supplementation has also been used to treat patients
with creatine deficiency-related gyrate atrophy
[152–156]. These findings and others provide promise
that high-dose creatine monohydrate supplementation
may be an effective adjunctive therapy for children and
adults with creatine synthesis deficiencies [18, 145, 157–
159]. Additionally, these reports provide strong evidence
regarding the long-term safety and tolerability of highdose
creatine supplementation in pediatric populations
with creatine synthesis deficiencies, including infants less
than 1 year of age [157].
Neurodegenerative diseases
A number of studies have investigated the short and longterm
therapeutic benefit of creatine supplementation in
children and adults with various neuromuscular diseases
like muscular dystrophies [160–165], Huntington’s disease
[23, 166–171]; Parkinson disease [23, 40, 166, 172–174];
mitochondria-related diseases [29, 175–177]; and,
amyotrophic lateral sclerosis or Lou Gehrig’s Disease
[166, 178–184]. These studies have provided some
evidence that creatine supplementation may improve
exercise capacity and/or clinical outcomes in these
patient populations. However, Bender and colleagues
[23] recently reported results of several large clinical
trials evaluating the effects of creatine supplementation
in patients with Parkinson’s disease (PD),
Huntington’s disease (HD), and amyotrophic lateral
sclerosis (ALS). A total of 1,687 patients took an
average of 9.5 g/day of creatine for a total of 5,480
patient years. Results revealed no clinical benefit on
patient outcomes in patients with PD or ALS. However,
there was some evidence that creatine supplementation
slowed down progression of brain atrophy
in patients with HD (although clinical markers were
unaffected). Whether creatine supplementation may
have a role in mediating other clinical markers in
these patient populations and/or whether individual
patients may respond more positively to creatine supplementation
than others, remain to be determined.
Nevertheless, these studies show that creatine supplementation
has been used to treat children and adults
with neurodegenerative conditions and is apparently
Kreider et al. Journal of the International Society of Sports Nutrition (2017) 14:18 Page 9 of 18
safe and well-tolerated when taking up to 30 g/day
for 5 years in these populations.
Ischemic heart disease
Creatine and phosphocreatine play an important role in
maintaining myocardial bioenergetics during ischemic
events [33]. For this reason, there has been interest in
assessing the role of creatine or phosphocreatine in reducing
arrhythmias and/or improving heart function
during ischemia [185–194]. In a recent review, Balestrino
and colleagues [33] concluded that phosphocreatine
administration, primarily as an addition to
cardioplegic solutions, has been used to treat myocardial
ischemia and prevent ischemia-induced arrhythmia and
improve cardiac function with some success. They suggested
that creatine supplementation may protect the
heart during an ischemic event. Thus, prophylactic creatine
supplementation may be beneficial for patients at
risk for myocardial ischemia and/or stroke.
Aging
A growing collection of evidence supports that creatine
supplementation may improve health status as individuals
age [41, 43–45, 195]. In this regard, creatine supplementation
has been reported to help lower cholesterol
and triglyceride levels [67, 196]; reduce fat accumulation
in the liver [197]; reduce homocysteine levels [198];
serve as an antioxidant [199–202]; enhance glycemic
control [132, 203–205]; slow tumor growth in some
types of cancers [32, 198, 206, 207]; increase strength
and/or muscle mass [37, 41, 44, 45, 82, 208–212];
minimize bone loss [211, 212]; improve functional capacity
in patients with knee osteoarthritis [213] and fibromyalgia
[214]; positively influence cognitive function
[43, 83, 195]; and in some instances, serve as an antidepressant
[215–217].
For example, Gualano and associates supplemented
patients with type II diabetes with a placebo or creatine
(5 g/day) for 12 weeks during training. Creatine supplementation
significantly decreased HbA1c and glycemic
response to standardized meal as well as increased
GLUT-4 translocation. These findings suggest that creatine
supplementation combined with an exercise program
improves glycemic control and glucose disposal in type
2 diabetic patients. Candow and others [211] reported
that low-dose creatine (0.1 g/kg/day) combined with
protein supplementation (0.3 g/kg/day) increased lean
tissue mass and upper body strength while decreasing
markers of muscle protein degradation and bone resorption
in older men (59–77 years). Similarly, Chilibeck et
al. [212] reported that 12 months of creatine supplementation
(0.1 g/kg/day) during resistance training increased
strength and preserved femoral neck bone mineral density
and increased femoral shaft subperiosteal width in
postmenopausal women. A recent meta-analysis [80] of
357 elderly individuals (64 years) participating in an average
of 12.6 weeks of resistance training found that participants
supplementing their diet with creatine experienced
greater gains in muscle mass, strength, and functional
capacity. These findings were corroborated in a metaanalysis
of 405 elderly participants (64 years) who experienced
greater gains in muscle mass and upper body
strength with creatine supplementation during resistancetraining
compared to training alone [37]. These findings
suggest that creatine supplementation can help prevent
sarcopenia and bone loss in older individuals.
Finally, a number of studies have shown that creatine
supplementation can increase brain creatine content
generally by 5 – 15% [218–220]. Moreover, creatine supplementation
can reduce mental fatigue [221] and/or improve
cognitive function [83, 222–225]. For example,
Watanabe et al. [221] reported that creatine supplementation
(8 g/day for 5 days) reduced mental fatigue when
subjects repeatedly performed a simple mathematical
calculation as well as increased oxygen utilization in the
brain. Rae and colleagues [222] reported that creatine
supplementation (5 g/day for 6 weeks) significantly
improved working memory and intelligence tests requiring
speed of processing. McMorris and coworkers
[224] found that creatine supplementation
(20 g/day for 7 days) after sleep deprivation demonstrated
significantly less decrement in performance in
random movement generation, choice reaction time,
balance and mood state suggesting that creatine improves
cognitive function in response to sleep
deprivation. This research group also examined the
effects of creatine supplementation (20 g/day for 7
days) on cognitive function in elderly participants
and found that creatine supplementation significantly
improved performance on random number generation,
forward spatial recall, and long-term memory
tasks. Ling and associates [225] reported that creatine
supplementation (5 g/day for 15 days) improved
cognition on some tasks. Since creatine uptake by
the brain is slow and limited, current research is investigating
whether dietary supplementation of creatine
precursors like GAA may promote greater
increases in brain creatine [226, 227]. One recent
study suggested that GAA supplementation (3 g/day)
increased brain creatine content to a greater degree
than creatine monohydrate [227].
Pregnancy
Since creatine supplementation has been shown to
improve brain and heart bioenergetics during ischemic
conditions and possess neuroprotective properties,
there has been recent interest in use of creatine
Kreider et al. Journal of the International Society of Sports Nutrition (2017) 14:18 Page 10 of 18
during pregnancy to promote neural development and
reduce complications resulting from birth asphyxia
[228–237]. The rationale for creatine supplementation
during pregnancy is that the fetus relies upon placental
transfer of maternal creatine until late in pregnancy and
significant changes in creatine synthesis and excretion
occur as pregnancy progresses [230, 232]. Consequently,
there is an increased demand for and utilization of
creatine during pregnancy. Maternal creatine supplementation
has been reported to improve neonatal survival
and organ function following birth asphyxia in
animals [228, 229, 231, 233–235, 237]. Human studies
show changes in the maternal urine and plasma creatine
levels across pregnancy and association to maternal
diet [230, 232]. Consequently, it has been
postulated that there may be benefit to creatine supplementation
during pregnancy on fetal growth, development,
and health [230, 232]. This area of research
may have broad implications for fetal and child development
and health.
Safety
Since creatine monohydrate became a popular dietary supplement
in the early 1990s, over 1,000 studies have been
conducted and billions of servings of creatine have been
ingested. The only consistently reported side effect from
creatine supplementation that has been described in the literature
has been weight gain [5, 22, 46, 78, 91, 92, 112].
Available short and long-term studies in healthy and diseased
populations, from infants to the elderly, at dosages
ranging from 0.3 to 0.8 g/kg/day for up to 5 years have consistently
shown that creatine supplementation poses no adverse
health risks and may provide a number of health and
performance benefits. Additionally, assessments of adverse
event reports related to dietary supplementation, including
in pediatric populations, have revealed that creatine was
rarely mentioned and was not associated with any significant
number or any consistent pattern of adverse events
[238–240]. Unsubstantiated anecdotal claims described in
the popular media as well as rare case reports described in
the literature without rigorous, systematic causality assessments
have been refuted in numerous well-controlled clinical
studies showing that creatine supplementation does not
increase the incidence of musculoskeletal injuries [22, 111,
112, 241], dehydration [111, 112, 117, 122, 127–129, 242],
muscle cramping [76, 106, 111, 112, 117], or gastrointestinal
upset [22, 111, 112, 241]. Nor has the literature provided
any support that creatine promotes renal dysfunction
[22, 51, 85, 114, 156, 172, 243–248] or has long-term detrimental
effects [22, 23, 53, 155, 172]. Rather, as noted above,
creatine monohydrate supplementation has been found to
reduce the incidence of many of these anecdotally reported
side effects.
With regard to the question of whether creatine has
effect on renal function, a few case studies [249–252] reported
that individuals purportedly taking creatine with
or without other supplements presented with high creatinine
levels and/or renal dysfunction [249–251]. Additionally,
one study suggested that feeding rats with renal
cystic disease 2 g/kg/d of creatine for 1 week (equivalent
to 140 g/day for a 70 kg individual) and 0.4 g/kg/d
(equivalent to 28 g/day for a 70 kg individual) for 4
weeks exacerbated disease progression. These reports
prompted some concern that creatine supplementation
may impair renal function [253–256] and prompted a
number of researchers to examine the impact of creatine
supplementation on renal function [22, 51, 85, 114, 156,
172, 243–248, 257–259]. For example, Ferreira and associates
[260] reported that creatine feeding (2 g/kg/d for
10 weeks equivalent to 140 g/kg/d in a 70 kg person)
had no effects on glomerular filtration rate and renal
plasma flow in Wistar rats. Likewise, Baracho and colleagues
[261] reported that Wistar rats fed 0, 0.5, 1, or
2 g/kg/d of creatine did not result in renal and/or hepatic
toxicity. Poortmans and coworkers reported that
ingesting 20 g/day of creatine for 5 days [243], and up to
10 g/day from 10 months to 5 years [257] had no effect
on creatine clearance, glomerular filtration rate, tubular
resorption, or glomerular membrane permeability compared
to controls. Kreider et al. [22] reported that creatine
supplementation (5–10 g/day for 21 months) had no
significant effects on creatinine or creatinine clearance
in American football players. Gualono and associates
[262] reported that 12 weeks of creatine supplementation
had no effects on kidney function in type 2 diabetic
patients. Finally, creatine supplement has been used as a
means of reducing homocysteine levels and/or improving
patient outcomes in patients with renal disease
[263–265] as well as ameliorating birth asphyxia related
renal dysfunction in mice [228]. Moreover, long-term,
high dose ingestion of creatine (up to 30 g/d for up
to 5 years) in patient populations has not been associated
with an increased incidence of renal dysfunction
[23, 155, 156, 172]. While some have suggested
that individuals with pre-existing renal disease consult
with their physician prior to creatine supplementation
in an abundance of caution, these studies and others
have led researchers to conclude that there is no
compelling evidence that creatine supplementation
negatively affects renal function in healthy or clinical
populations [5, 6, 22, 53, 259, 266, 267].
Performance-related studies in adolescents, younger
individuals, and older populations have consistently reported
ergogenic benefits with no clinically significant
side effects [5, 6, 22, 23, 53, 113, 129, 244, 245, 268].
The breadth and repetition of these findings provide
compelling evidence that creatine monohydrate is wellKreider
et al. Journal of the International Society of Sports Nutrition (2017) 14:18 Page 11 of 18
tolerated and is safe to consume in healthy untrained
and trained individuals regardless of age. Moreover, as
noted above, the number of potential medical uses of
creatine supplementation that can improve health and
well-being as one ages and/or may provide therapeutic
benefit in clinical populations ranging from infants to
senior adults has continued to grow without identifying
significant risks or adverse events even in these diseased
or compromised special populations. It is no wonder
that Wallimann and colleagues [27] recommended that
individuals should consume 3 g/day of creatine throughout
the lifespan to promote general health.
Some critics of creatine supplementation have pointed
to warnings listed on some product labels that individuals
younger than 18 years of age should not take creatine
as evidence that creatine supplementation is unsafe
in younger populations. It’s important to understand that
this is a legal precaution and that there is no scientific
evidence that children and/or adolescents should not
take creatine. As noted above, a number of short- and
long-term studies using relatively high doses of creatine
have been conducted in infants, toddlers and adolescents
with some health and/or ergogenic benefit observed.
These studies provide no evidence that use of creatine at
recommended doses pose a health risk to individuals less
than 18 years of age. Creatine supplementation may, however,
improve training adaptations and/or reduce risk to
injury, including in younger athletes. For this reason, it is
our view that creatine supplementation is an acceptable
nutritional strategy for younger athletes who: a.) are involved
in serious/competitive supervised training; b.) are
consuming a well-balanced and performance enhancing
diet; c.) are knowledgeable about appropriate use of creatine;
and d.) do not exceed recommended dosages.
Position of the international society of sports
nutrition (ISSN)
After reviewing the scientific and medical literature in
this area, the International Society of Sports Nutrition
concludes the following in terms of creatine supplementation
as the official Position of the Society:
1. Creatine monohydrate is the most effective
ergogenic nutritional supplement currently available
to athletes with the intent of increasing highintensity
exercise capacity and lean body mass during
training.
2. Creatine monohydrate supplementation is not only
safe, but has been reported to have a number of
therapeutic benefits in healthy and diseased
populations ranging from infants to the elderly.
There is no compelling scientific evidence that the
short- or long-term use of creatine monohydrate (up
to 30 g/day for 5 years) has any detrimental effects
on otherwise healthy individuals or among clinical
populations who may benefit from creatine
supplementation.
3. If proper precautions and supervision are provided,
creatine monohydrate supplementation in children
and adolescent athletes is acceptable and may
provide a nutritional alternative with a favorable
safety profile to potentially dangerous anabolic
androgenic drugs. However, we recommend that
creatine supplementation only be considered for use
by younger athletes who: a.) are involved in serious/
competitive supervised training; b.) are consuming a
well-balanced and performance enhancing diet; c.)
are knowledgeable about appropriate use of creatine;
and d.) do not exceed recommended dosages.
4. Label advisories on creatine products that caution
against usage by those under 18 years old, while
perhaps intended to insulate their manufacturers
from legal liability, are likely unnecessary given the
science supporting creatine’s safety, including in
children and adolescents.
5. At present, creatine monohydrate is the most
extensively studied and clinically effective form of
creatine for use in nutritional supplements in terms
of muscle uptake and ability to increase highintensity
exercise capacity.
6. The addition of carbohydrate or carbohydrate and
protein to a creatine supplement appears to increase
muscular uptake of creatine, although the effect on
performance measures may not be greater than
using creatine monohydrate alone.
7. The quickest method of increasing muscle creatine
stores may be to consume ~0.3 g/kg/day of creatine
monohydrate for 5–7-days followed by 3–5 g/day
thereafter to maintain elevated stores. Initially,
ingesting smaller amounts of creatine monohydrate
(e.g., 3–5 g/day) will increase muscle creatine stores
over a 3–4 week period, however, the initial
performance effects of this method of
supplementation are less supported.
8. Clinical populations have been supplemented with
high levels of creatine monohydrate (0.3 – 0.8 g/kg/
day equivalent to 21–56 g/day for a 70 kg individual)
for years with no clinically significant or serious
adverse events.
9. Further research is warranted to examine the
potential medical benefits of creatine monohydrate
and precursors like guanidinoacetic acid on sport,
health and medicine.
Conclusion
Creatine monohydrate remains one of the few nutritional
supplements for which research has consistently shown
Kreider et al. Journal of the International Society of Sports Nutrition (2017) 14:18 Page 12 of 18
has ergogenic benefits. Additionally, a number of potential
health benefits have been reported from creatine supplementation.
Comments and public policy related to
creatine supplementation should be based on careful assessment
of the scientific evidence from well-controlled
clinical trials; not unsubstantiated anecdotal reports,
misinformation published on the Internet, and/or poorly
designed surveys that only perpetuate myths about
creatine supplementation. Given all the known benefits
and favorable safety profile of creatine supplementation
reported in the scientific and medical literature, it is the
view of ISSN that government legislatures and sport organizations
who restrict and/or discourage use of creatine
may be placing athletes at greater risk—particularly in
contact sports that have risk of head trauma and/or
neurological injury thereby opening themselves up to legal
liability. This includes children and adolescent athletes
engaged in sport events that place them at risk for head
and/or spinal cord injury.
Acknowledgements
We would like to thank all of the participants and researchers who
contributed to the research studies and reviews described in this position
stand. Your dedication to conducing groundbreaking research has improved
the health and well-being of countless athletes and patients.
Prepared as a Position Stand on behalf of the International Society of Sport
Nutrition with approval of Editors-In-Chief, Founders, and Research
Committee Members.
Funding
Support to prepare this manuscript was provided by the Council for
Responsible Nutrition.
Availability of data and materials
Not applicable.
Authors’ contributions
RBK prepared the manuscript. Remaining coauthors reviewed, edited, and
approved the final manuscript. The manuscript was then approved by the
Research Committee and Editors-In Chief to represent the official position of
the International Society of Sports Nutrition.
Competing interests
RBK is a co-founder of the International Society of Sports Nutrition (ISSN) and
has received externally-funded grants from industry to conduct research on
creatine, serves as a scientific and legal consultant, and is a university approved
scientific advisor for Nutrabolt. He prepared this position stand update at the
request of the Council for Responsible Nutrition and ISSN. DSK is a co-founder
of the ISSN who works for a contract research organization (QPS). QPS has
received research grants from companies who sell creatine. DSK sits in an
advisory board (Post Holdings) to Dymatize that sells creatine. DSK declares no
other conflicts of interest. JA is the CEO and co-founder of the ISSN; has
consulted in the past for various sports nutrition brands. TNZ has received
grants and contracts to conduct research on dietary supplements; has
served as a paid consultant for industry; has received honoraria for
speaking at conferences and writing lay articles about sports nutrition
ingredients; receives royalties from the sale of several sports nutrition
products; and has served as an expert witness on behalf of the plaintiff
and defense in cases involving dietary supplements. TNZ is also co-inventor on
multiple patent applications within the field of dietary supplements, applied
nutrition and bioactive compounds. RW is the Chief Science Officer for Post
Active Nutrition. ALA is CEO of Vitargo Global Sciences, Inc., a company that
markets and sells a high insulinemic, starch-based carbohydrate. HLL has
received research grants from companies who sell creatine and do business in
the dietary supplement, natural products and medical foods industry. HLL is cofounder
of Supplement Safety Solutions, LLC, serving as an independent
consultant for regulatory compliance, safety surveillance and Nutravigilance to
companies who sell creatine. Dr. Lopez is also co-inventor on multiple patent
applications within the field of dietary supplements, applied nutrition
and bioactive compounds. Remaining investigators have no competing
interests to declare. The comments and positions taken in this paper do
not constitute an endorsement by institution’s the authors are affiliated.
Consent for publication
Not applicable.
Ethics approval and consent to participate
This paper was reviewed by the International Society of Sports Nutrition
Research Committee and represents the official position of the Society.
Publisher’s Note
Springer Nature remains neutral with regard to jurisdictional claims in
published maps and institutional affiliations.
Author details
1
Exercise & Sport Nutrition Lab, Human Clinical Research Facility, Department
of Health & Kinesiology, Texas A&M University, College Station, TX
77843-4243, USA. 2
Nutrition Research Unit, QPS, 6141 Sunset Drive Suite 301,
Miami, FL 33143, USA. 3
Department of Health and Human Performance,
Nova Southeastern University, Davie, FL 33328, USA. 4
The Center for Applied
Health Sciences, 4302 Allen Road, STE 120, Stow, OH 44224, USA. 5
Post
Active Nutrition, 111 Leslie St, Dallas, TX 75208, USA. 6
Collins Gann
McCloskey & Barry, PLLC, 138 Mineola Blvd., Mineola, NY 11501, USA. 7
Faculty
of Kinesiology and Health Studies, University of Regina, Regina, SK S4S 0A2,
Canada. 8
High Performance Nutrition, LLC, Mercer Island, WA 98040, USA.
9
Vitargo Global Sciences, Inc., Dana Point, CA 92629, USA. 10
Supplement
Safety Solutions, LLC, Bedford, MA 01730, USA.
Received: 27 April 2017 Accepted: 30 May 2017
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