Health Reference LibraryCreatine: which form, what dose, and who actually benefits?
This entry is part of the Nutri Tailor Health Reference Library — cited research on supplements, nutrients and adjacent areas of health.
Summary
Creatine monohydrate at 3 to 5 g daily is one of the best supported supplements in the whole evidence base. The ISSN position stand anchors it: monohydrate is the default, specialty forms have never justified their premium, loading is optional because the same muscle saturation arrives after about four weeks at the maintenance dose, and safety data runs past five years of continuous use. The people who benefit most are anyone doing resistance or high intensity training, older adults training against muscle loss, and vegetarians, whose baseline stores run lower. The cognitive evidence is real but conditional, showing up mainly under sleep deprivation and mental fatigue rather than at rest.
How it works
Creatine is stored in muscle as phosphocreatine, the fastest system your body has for regenerating ATP during short intense efforts. Supplementation raises muscle stores by roughly a fifth, which is why it helps repeated sprints and heavy sets rather than steady endurance. The brain runs the same energy system, which explains why the cognitive findings concentrate where energy demand outstrips supply, such as sleep deprivation and mental fatigue.
Effective dose
The maintenance dose is 3 to 5 g daily, taken every day including rest days. A loading phase of 20 g daily split into four doses for five to seven days saturates muscle faster but is optional, because 3 to 5 g daily reaches the same end point in about four weeks. Loading brings more digestive grumbling and quicker water weight, which is the main reason to skip it.
Forms compared
Creatine monohydrate is the form behind the vast majority of the research and the ISSN position stand default. It is stable, cheap and well absorbed. HCl, ethyl ester, buffered creatine and the other premium variants have no consistent evidence of better absorption or better outcomes, so paying more for them buys marketing rather than effect. Micronised monohydrate is simply monohydrate milled finer so it mixes more easily.
Timing
Timing barely matters. A small trial nudged in favour of post workout, but the effect is marginal next to simply never missing days. Taking it with food that contains carbohydrate or protein modestly helps muscle uptake. Pick a moment you will keep, such as with breakfast, and let consistency do the work.
Safety profile
Expect half a kilo to two kilos of early weight from intramuscular water and, over months of training, lean mass. In healthy kidneys creatine is safe across long term studies. The point everyone should know: serum creatinine can read modestly higher because creatine converts to creatinine, so a routine kidney blood test can look worse without the kidneys changing at all. Tell your GP you take creatine before such tests. Established kidney disease is different territory and needs professional oversight before supplementing.
Special populations
Older adults pair creatine with resistance training for the strongest evidence of preserved muscle and strength. Vegetarians and vegans start with lower muscle stores and respond more. In pregnancy standard doses have no signal of harm but no adequate safety studies either, so the default is to discuss with a GP rather than continue by momentum. Anyone with kidney disease should involve their specialist first.
Interactions
The old idea that caffeine cancels creatine came from one 1996 study and later work has not consistently confirmed it, so taking both is fine. Sensible caution applies alongside diuretics, because both affect fluid balance, and alongside drugs that stress the kidneys, such as sustained high dose NSAIDs, where mentioning creatine to the prescriber is wise rather than mandatory. Creatine appears on no banned substance list and is legal in all major sports.
Guideline positions
The anchor is the 2017 International Society of Sports Nutrition position stand on creatine, covering form, dose, loading and long term safety. On top of it sit the 2017 meta-analysis of creatine with resistance training in older adults showing augmented lean mass and strength, and the 2018 systematic review of creatine and cognition finding benefit concentrated in sleep deprived and mentally fatigued states.
Practical framework
Buy plain monohydrate, take 3 to 5 g every day with food, skip the loading phase unless you have a reason to hurry, and give it four to six weeks alongside training before judging. Measure it against training performance, such as reps at a set weight, rather than the scale, which the water shift muddies early on. If a routine blood test is coming, mention the creatine.
Common misconceptions
Creatine is not a steroid and does not act on hormones in any established way. It does not damage healthy kidneys; it changes one kidney related lab number by a measurement quirk. The hair loss claim traces to a single small study of 20 rugby players showing a DHT rise that later work never replicated, and actual hair loss has never been demonstrated. And loading is not required, merely faster.
Sources
- Kreider RB, Kalman DS, Antonio J, Ziegenfuss TN, Wildman R, Collins R, Candow DG, Kleiner SM, Almada AL, Lopez HL 2017. International Society of Sports Nutrition position stand: safety and efficacy of creatine supplementation in exercise, sport, and medicine. Journal of the International Society of Sports Nutrition.
- Chilibeck PD, Kaviani M, Candow DG, Zello GA 2017. Effect of creatine supplementation during resistance training on lean tissue mass and muscular strength in older adults: a meta-analysis. Open Access Journal of Sports Medicine.
- Avgerinos KI, Spyrou N, Bougioukas KI, Kapogiannis D 2018. Effects of creatine supplementation on cognitive function of healthy individuals: a systematic review of randomized controlled trials. Experimental Gerontology.
- van der Merwe J, Brooks NE, Myburgh KH 2009. Three weeks of creatine monohydrate supplementation affects dihydrotestosterone to testosterone ratio in college-aged rugby players. Clinical Journal of Sport Medicine.