Creatine
One of the most thoroughly studied supplements in the world — supports strength, muscle mass and, according to newer research, cognitive function.
Number of studies
3
Safety
Moderate
Time to effects
First strength effects after 1–2 weeks; full muscle saturation and maximum effect after about 3–4 weeks of regular use.
Monthly cost
ok. 15–25 zł/miesiąc
Price in Poland
40–70 zł za 500 g monohydratu (ok. 100 porcji po 5 g)
Who it's for
Droższe formy (HCl, buforowana) potrafią kosztować 2–3× więcej bez potwierdzonej przewagi nad monohydratem.
Indicative prices for the Polish market — we don't point to specific retailers; the real price depends on the manufacturer, form and place of purchase.
Table of contents
TL;DR
One of the most thoroughly studied supplements in the world — supports strength, muscle mass and, according to newer research, cognitive function.
- →Increased maximal strength and power in resistance training
- →Support for lean muscle mass gains when combined with resistance training
- →Possible improvement in cognitive performance under sleep deprivation or high metabolic brain demand
| Chemical compound | Methylguanidinoacetic acid (from glycine, arginine and methionine) |
|---|---|
| Group | Ergogenic supplement / nitrogenous compound |
| Form | Creatine monohydrate (powder), capsules, effervescent tablets |
| Evidence level | Strong — one of the most thoroughly studied supplements (ISSN, 30+ years of research) |
| Interactions | Minimal — theoretical at very high doses of caffeine/NSAIDs |
| Status | Dietary supplement, permitted in competitive sport (not on the WADA list) |
| Typical dose | 3–5 g/day |
Understand
Overview
Creatine is a naturally occurring organic compound built from three amino acids (glycine, arginine and methionine), stored mainly in skeletal muscle (about 95% of total body stores), where it takes part in the rapid resynthesis of ATP. The body produces roughly 1 g per day endogenously in the liver, kidneys and pancreas, with the rest of daily needs coming from the diet — mainly red meat and fish — which is why vegetarians and vegans typically start out with lower muscle creatine stores.
Supplementing with creatine monohydrate is one of the best-documented interventions in sports science, backed by more than three decades of clinical research, and it is recommended by the International Society of Sports Nutrition as safe and effective for both athletes and recreational trainees.
Real strength and muscle gains are felt mainly by people who train regularly with resistance or high-intensity work — creatine increases the energy available for muscle contraction, but without a training stimulus, simply taking it will not build strength or muscle mass on its own. The biggest gains go to people with lower starting stores, namely vegetarians and vegans, and — in the context of preventing sarcopenia — people over 60 who combine supplementation with resistance training. The cognitive effect is considerably more conditional: available reviews suggest that improvements in short-term memory and processing speed show up mainly under sleep deprivation or increased brain energy demand, not in well-rested young adults — so treating creatine as a universal 'nootropic' isn't well supported by the data.
History of use
Creatine was first isolated in 1832 by the French chemist Michel Eugène Chevreul from meat extract, naming it after the Greek word 'kreas' (meat). For most of the 19th and 20th centuries it remained a biochemical curiosity, until the early 1990s, when reports of its use by leading track and field athletes at the 1992 Barcelona Olympics sparked a commercial boom — the first creatine monohydrate products hit the sports supplement market in the mid-1990s and have since been the subject of some of the most extensive clinical research of any supplement.
Mechanism of action
Creatine increases the phosphocreatine pool in muscle, which speeds up ATP resynthesis during short, high-intensity effort (e.g. sets of 1–15 reps, sprints). It also affects muscle cell hydration (so-called cell volumization), which can itself act as an anabolic stimulus, and may support cell signaling related to muscle protein synthesis via the IGF-1/mTOR pathway. Imaging studies (MR spectroscopy) also point to increased phosphocreatine availability in brain tissue, which underlies hypotheses about effects on cognitive function under conditions of increased brain energy demand.
At the cellular level, creatine is transported from the bloodstream into muscle fibers via the membrane transporter CreaT1 (encoded by the SLC6A8 gene), whose activity increases under the influence of insulin — hence the (not essential, but helpful) practice of pairing a dose with a carbohydrate-protein meal. Inside the cell, the enzyme creatine kinase catalyzes the reversible transfer of a phosphate group from phosphocreatine to ADP, instantly regenerating ATP without oxygen — this so-called phosphagen system is what supplies energy during the first several seconds of maximal effort, before the slower glycolytic and aerobic pathways take over.
Absorption and transport
Creatine from food or a supplement enters the bloodstream and is taken up by muscle cells via the CreaT1 transporter.
Storage as phosphocreatine
In muscle, most of the accumulated creatine is phosphorylated to phosphocreatine, forming a rapidly available energy reserve.
Instant ATP resynthesis
During short, intense effort, creatine kinase transfers a phosphate group from phosphocreatine to ADP, regenerating ATP without oxygen.
Muscle cell hydration
Increased intracellular creatine content binds water (cell volumization), which may additionally stimulate anabolic signaling.
Cumulative training effect
A larger available energy pool across successive sets allows for greater training volume, which over time translates into gains in strength and muscle mass.
Evidence: strong — based on 3 studies in this database.
Benefits
Common myths
MythCreatine damages the kidneys and liver in healthy people.
FactMeta-analyses of long-term supplementation in healthy people show no negative effect on kidney or liver function.
MythCreatine is an anabolic steroid.
FactIt's a natural compound present in the diet (meat, fish) and produced endogenously by the body — its mechanism of action has nothing to do with anabolic hormones.
MythWeight gain from creatine is just 'water,' not real results.
FactPart of the initial weight gain is indeed intracellular water, but over the long term creatine also supports real gains in strength and lean muscle mass.
Forms & variants
Creatine comes in several forms that differ in bioavailability and use case — the form you pick genuinely matters for how effective the supplementation is.
Creatine monohydrate
The gold standard — the form with the most research confirming its effectiveness and safety, and the best value for money.
Best for: The default choice for the vast majority of people
Micronized creatine
Monohydrate ground into smaller particles — better solubility in liquids, biologically identical effectiveness to regular monohydrate.
Best for: People bothered by the sediment of regular monohydrate in a drink
Kre-Alkalyn (buffered creatine)
A higher-pH version, marketed as eliminating the need for a loading phase — studies show no advantage over regular monohydrate at comparable doses.
Best for: No meaningful advantage — the higher price isn't justified
Creatine hydrochloride (Creatine HCl)
Better water solubility thanks to the attached HCl group, marketed as requiring lower doses — there is little direct head-to-head research against monohydrate.
Best for: People who prefer a smaller serving volume and are willing to pay more without hard evidence of an advantage
Creatine ethyl ester
Theoretically meant to absorb better through cell membranes, but studies found lower stability and worse results than monohydrate.
Best for: Not recommended — worse results in head-to-head studies than monohydrate
Practice
Frequently asked questions
Meta-analyses of long-term supplementation in healthy people show no negative effect on kidney function. People with existing kidney disease should consult a doctor before supplementing.
It isn't necessary — a steady dose of 3–5 g/day saturates the muscles within about 3–4 weeks, giving the same end result as a loading phase, just spread out over time.
Yes, the mechanism of action is analogous, though some research suggests slightly different water-related dynamics tied to the hormonal cycle.
There's no evidence pointing to a need for cycling — studies covering continuous supplementation lasting several years have shown no loss of effectiveness or adverse effects linked to not taking breaks.
In head-to-head comparisons, none of the alternative forms have shown higher effectiveness than standard monohydrate — the differences are mainly about solubility and price, not muscle-building effects.
Dosage & timing
Typical dose
3–5 g per day (maintenance phase); optional loading phase of 20 g/day for 5–7 days
Form
Creatine monohydrate (the best-studied form)
Dosing is informational and reflects the ranges used in the cited studies — it does not replace consulting a doctor or pharmacist.
Best times to take it
- Time of day is of secondary importance
- Can be taken with a meal containing carbohydrates/protein for better uptake
What to combine with
Good combinations
beta alanina — A common combination in strength-endurance sports
Safety
Side effects & contraindications
Possible side effects
Possible water retention and a small increase in body weight when starting supplementation
Rarely: gastrointestinal discomfort with high single doses
Contraindications
Kidney disease — only after consulting a doctor
Insufficient safety data for pregnancy and breastfeeding
Interactions
Caffeine at very high doses may theoretically blunt some of the ergogenic effects
NSAIDs — theoretical kidney burden when both substances are overused at the same time
Is it worth taking?
Who it's for
- People doing resistance training and high-intensity sports
- Vegetarians and vegans (lower dietary creatine stores)
- People 60+ as part of sarcopenia prevention (together with resistance training)
Not for
- Kidney disease — only after consulting a doctor
- Insufficient safety data for pregnancy and breastfeeding
Evidence
Worth knowing
Creatine is one of the few supplements the International Society of Sports Nutrition recommends as safe for continuous use, with no need for breaks.
A loading phase isn't necessary — a steady dose of 3–5 g/day gives the same end result, just spread out over time.
Very high doses of caffeine taken at the same time may theoretically blunt some of creatine's ergogenic effects.
Studies
More than three decades of clinical research confirm that creatine monohydrate is safe and effective for both athletes and recreational trainees.
Kreider RB, et al., Journal of the International Society of Sports Nutrition, 2017
International Society of Sports Nutrition position stand: creatine supplementation and exercise
Strong evidenceKreider RB, et al. · Journal of the International Society of Sports Nutrition · 2017
A position-stand review summarizing decades of research — confirms the effectiveness and safety of creatine monohydrate in athletic populations.
View studyCreatine supplementation and cognitive performance in healthy adults: a systematic review
Moderate evidenceAvgerinos KI, et al. · Experimental Gerontology · 2018
A review pointing to a potential improvement in short-term memory and processing speed, stronger under sleep deprivation or in older adults.
View studyLong-term creatine supplementation does not significantly affect clinical markers of health
Strong evidenceKreider RB, et al. · Molecular and Cellular Biochemistry · 2003
An observation of athletes using creatine for up to 5 years found no negative effect on markers of kidney and liver function.
View studySources & bibliography
Citations are illustrative for this demo version and require full bibliographic verification by the editorial team before production publication.
Compare with similar entries
About the authors of this entry
Author
Michał NowakClinical Dietitian
Michał specializes in metabolic nutrition, intermittent fasting and sports supplementation.
46 publications on this site
Medical review
dr Piotr ZielińskiEndocrinologist
Piotr reviews content on hormones, metabolic health and supplement pharmacology.
47 publications on this site
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Comments (2)
- KW
Kasia W. 2 weeks ago
Very clearly explained, especially the interactions section — I hadn't seen it laid out this well anywhere else.
- MT
Marek T. a month ago
Are you planning to update this with the newest study from this year? I saw an interesting meta-analysis.