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Creatine — The Complete Guide

The most-researched sports supplement there is — and now a serious brain-health candidate. Which form, how much for muscle vs. the brain, and what the newest studies show.

Reviewed by Bodil Isaksson, Licensed Biomedical Scientist (Sweden)Last reviewed July 2026Supplement guide

SupplementsPerformanceCreatineMuscle & brain

Creatine is the most-studied supplement in sports nutrition, with a strong safety record and clear benefits for strength and power — and a fast-growing body of research on the brain.

Key takeaways

  • Creatine monohydrate is the gold standard — a plain, third-party-tested (or Creapure®) powder is all you need.
  • Take 3–5 g/day, every day; a 5–7 day “loading” phase (~20 g/day) is optional and just fills stores faster.
  • Proven for strength and muscle; promising for the brain (higher doses, mainly under stress or sleep loss) — and safe in healthy people.

What creatine is

Creatine is a compound your body makes (in the liver and kidneys) and stores mostly in muscle as phosphocreatine — a rapid energy buffer that regenerates ATP during short, intense effort. You also get about 1 g/day from meat and fish, so vegetarians and vegans start with lower stores and often respond most.1

Forms — and Creapure®

MonohydrateThe gold standard. By far the most studied and effective form; the ISSN states no other form has been shown to be superior.1
Creapure®A purity label, not a different molecule: 99.9%-pure creatine monohydrate (made by AlzChem, Germany), batch-tested and vegan. A quality guarantee — not a stronger product.
“Advanced” formsHCl, ethyl-ester, buffered/“Kre-Alkalyn” and blends are marketing upsells — none beats plain monohydrate, and several are less stable or under-researched.2

What we use. A plain Creapure® creatine monohydrate (99.9% pure, batch-tested) — the type of product we use. Any micronised, third-party-tested monohydrate works equally well.

How to take it

Simple: 3–5 g/day, every day
No loadingJust 3–5 g/day reaches full muscle stores in about 3–4 weeks, with less stomach upset. The simplest approach for most people.1
Loading (optional)~20 g/day (4 × 5 g) for 5–7 days fills stores faster, then drop to a daily 3–5 g.1
TimingDaily consistency matters more than timing. Take it with fluid, any time of day; there is a small post-workout edge but it is minor.2

Dose for muscle & performance

3–5 g/day (≈0.03 g/kg)

With resistance training, creatine reliably increases strength, power and lean mass across dozens of trials and meta-analyses. Some of the earliest gain is water drawn into muscle, with real tissue following over weeks. Benefits are clearest for high-intensity and repeated-effort work.1

Dose for the brain & cognition

Brain creatine is harder to raise than muscle, so cognitive effects may need higher doses (often 5–10 g/day) and longer, and show up most under stress.3

Sleep lossA single high dose (~0.35 g/kg, ~25 g) improved memory, attention and processing speed during sleep deprivation, with measurable shifts in brain energy phosphates — effects within 3–4 h, lasting up to 9 h.4
Everyday cognitionMost consistent in people with low baseline stores (vegetarians/vegans) or under stress; benefits in well-rested, well-fed people are smaller.3

This challenges the old idea that creatine “only works after weeks.” The brain field is young but moving fast.

The newest research (2024–2025)

Interest is expanding beyond the gym to cognition under sleep loss/stress, healthy ageing and sarcopenia, mood, and recovery.34 Recent controlled trials are also refining how much of the early lean-mass change is tissue versus water, and how dose and measurement interact.5 The consensus: for muscle it is proven; for the brain it is promising and dose-dependent — a genuine area to watch rather than a settled claim.

Safety & myths

Well establishedExtensively studied and safe in healthy people at recommended doses — no evidence of kidney or liver harm, dehydration or cramps.12
Blood testsCreatine can nudge blood creatinine up slightly — a harmless lab artefact, not kidney damage. Tell your doctor you take it before a kidney test.
Minor effectsMild water retention or stomach upset is mostly a loading-phase thing; splitting the dose and taking it with fluid helps.
Check firstThose with kidney disease, or who are pregnant or breastfeeding, should speak to a clinician before use.

Who benefits most

  • Anyone doing resistance or power training.
  • Vegetarians and vegans (low baseline stores — often the biggest response, including cognitively).
  • Older adults (muscle maintenance, and possibly brain).
  • People facing sleep deprivation or heavy cognitive load.

References

General adult guidance from position stands and peer-reviewed research; not a prescription. Brain applications are an emerging, dose-dependent area.

  1. Kreider RB, et al. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. J Int Soc Sports Nutr 2017;14:18. jissn.biomedcentral.com
  2. Antonio J, et al. Common questions and misconceptions about creatine supplementation. J Int Soc Sports Nutr 2021;18:13. jissn.biomedcentral.com
  3. Candow DG, et al. Creatine supplementation: more is likely better for brain bioenergetics, health and function. J Psychiatry Brain Sci 2024. jpbs.hapres.com
  4. Gordji-Nejad A, et al. Single dose creatine improves cognitive performance and induces changes in cerebral high-energy phosphates during sleep deprivation. Sci Rep 2024;14:4937. nature.com
  5. The Effect of Creatine Supplementation on Lean Body Mass with and Without Resistance Training. Nutrients 2025;17(6):1081. mdpi.com

This article summarises nutrition and exercise science for education. It is not a substitute for individual medical advice; consult a professional before starting a supplement, in pregnancy, or alongside medication.

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