Creatine monohydrate is among the best-studied sports supplements, and the evidence supports it for one clear purpose: a 2017 systematic review commissioned by the International Society of Sports Nutrition found short-term supplementation increased maximal power and strength by roughly 5 to 15 percent and training volume, with typical protocols of 3 to 5 grams daily. Evidence for hair loss, kidney harm, and cognitive benefits remains limited or conflicting.
Newspaper Daily publishes information, not medical advice. Creatine is sold as a dietary supplement in the United States and is not reviewed by the FDA for efficacy before marketing; people with kidney disease, those taking medications affecting the kidneys, and pregnant or breastfeeding women should consult a physician before use.
What is creatine and how does it work?
Creatine is a nitrogen-containing compound the body makes from the amino acids arginine, glycine, and methionine, and it is also obtained from meat and fish. About 95 percent of the body's store sits in skeletal muscle, where it is converted to phosphocreatine — a rapid energy reservoir that regenerates adenosine triphosphate, the cell's energy currency, during short bursts of high-intensity effort. Supplementation raises muscle creatine stores by roughly 20 to 40 percent, per the ISSN review, expanding that reservoir and allowing slightly more work per set.
Foods supply about 1 to 2 grams daily for omnivores and the body synthesizes a similar amount, so a 3-to-5-gram dose roughly triples normal intake. Vegetarians, whose stores run lower, tend to show larger increases.
What do the strongest trials show?
The performance literature is deep — hundreds of randomized trials and multiple meta-analyses. A 2003 meta-analysis of 22 trials found creatine users gained roughly 8 percent more in strength and 14 percent more in repetitions than placebo groups, and subsequent reviews repeatedly replicated the pattern. A 2012 International Society of Sports Nutrition position stand called creatine the most effective ergogenic supplement available for high-intensity exercise, reaffirmed in its 2017 review.
Gains compound with training rather than replacing it: trials pairing creatine with resistance exercise find greater lean mass and strength gains than placebo, typically a few additional percentage points over 8 to 12 weeks. In endurance sports, benefits are smaller and mixed.
Is creatine safe for kidneys and other organs?
For healthy people, the safety record is reassuring: the 2017 ISSN review noted that creatine at studied doses has not shown adverse effects on kidney or liver function in healthy individuals across trials lasting up to five years. The belief that creatine damages kidneys traces partly to a lab artifact — creatine breakdown raises serum creatinine, a marker used to estimate kidney function, without implying actual damage.
Genuine considerations remain. Creatine draws fluid into muscle, so scale weight typically rises 1 to 2 kilograms during loading — a documented water effect, not fat gain. Early reports of cramps and gastrointestinal upset have not been borne out in controlled comparisons, per the ISSN review. Long-term data in adolescents are thin, and position stands urge caution there.
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Does creatine cause hair loss?
The evidence consists essentially of one study: a 2009 college-age rugby trial found that a loading protocol increased dihydrotestosterone, a hormone implicated in male-pattern baldness, by about 56 percent, though the study did not measure hair loss itself. No published trial has directly linked creatine to balding, and the finding has not been replicated in the years since; a 2021 narrative review concluded the concern rests on unconfirmed hormonal signals. Researchers widely describe the hair-loss claim as unproven but not impossible to rule out fully.
Does creatine help the brain?
The cognitive literature is promising but early. Because the brain consumes phosphocreatine during demanding tasks, researchers have tested supplementation in sleep deprivation, depression, and aging. A 2018 systematic review found limited evidence for cognitive benefits in healthy adults, with larger effects in vegetarians and sleep-deprived subjects; a 2023 review in Nutritional Neuroscience reported memory and processing improvements under stress in several small trials, and a 2012 trial found augmentation benefits in women with major depression, though replication is lacking. No professional body recommends creatine for cognitive or psychiatric conditions.
What forms and doses does evidence support?
Creatine monohydrate is the form virtually all clinical trials used; the ISSN review found no superiority for newer, costlier forms. The standard approach is either a loading phase of 20 grams daily in divided doses for 5 to 7 days followed by 3 to 5 grams daily, or simply 3 to 5 grams from the start — loading saturates muscle within a week versus three to four weeks.
When to see a doctor or registered dietitian
Clinician input is warranted when kidney disease or a single functioning kidney is present, since safety data in impaired kidney function are lacking; when diuretics or nephrotoxic drugs are used; during pregnancy or breastfeeding, where supplementation is not studied; before use in adolescents, whose long-term safety data are limited; and when unexplained swelling or weight gain develops during supplementation. Anyone pursuing creatine for mood or cognitive concerns should discuss it as part of medical care, not in place of it.
The bottom line on creatine evidence
The performance case is strong: meta-analyses and position stands support creatine monohydrate at 3 to 5 grams daily for modest but real gains in strength, power, and training volume, with a safety record extending to five-year follow-up in healthy adults. Hair-loss fears rest on a single unreplicated hormone measurement, kidney fears on a lab-marker artifact, and cognitive benefits on early, small trials. As of 2026, the product with evidence behind it remains the oldest and cheapest one.