Creatine: the supplement that actually works

If you only take one supplement, take creatine. The evidence behind it is among the cleanest in the entire category, the cost is trivial, the side-effect profile is benign, and the effect size on strength, power, and lean mass is real and replicable across dozens of well-controlled trials. The 2017 International Society of Sports Nutrition position stand reviewed the entire literature and reached an unusually direct conclusion: creatine monohydrate is the most effective and safest ergogenic supplement available.^[1] Evidence: A

The performance evidence

Creatine increases the body's phosphocreatine stores, which the muscles use to rapidly regenerate ATP for high-intensity efforts. The mechanism is well-mapped; the human effects are documented:

• Strength gains: meta-analyses across dozens of trials consistently show 5-15% greater strength gains during resistance-training programs that include creatine vs placebo.^[1] Evidence: A
• Lean mass: roughly 1-2 kg additional lean mass over a multi-week training program, partly from increased intramuscular water (which is functional, not cosmetic) and partly from genuine hypertrophy potentiated by higher-volume training capacity.^[2] Evidence: A
• Power and repeated-sprint performance: consistent improvements in repeated-sprint and high-intensity-interval performance.

The effect isn't subtle. The signal isn't industry-funded marketing; it's been replicated by independent labs across populations from young athletes to older adults.

The cognitive case is real, with caveats

The brain uses ATP just as muscles do, and the same phosphocreatine system supports cognition. Multiple trials, particularly in vegetarians (who have lower baseline creatine stores) and in sleep-deprived adults, show modest improvements in working memory and reasoning tasks with supplementation.^[3] Evidence: B

For neurodegenerative conditions (Parkinson's, Huntington's, mild cognitive impairment), the evidence is more mixed: small clinical trials with positive signal, larger ones with weaker results.^[4] Evidence: C Don't treat creatine as a cure for any disease; do recognize the cognitive support is plausible and small for healthy adults, meaningful in some clinical contexts.

The bigger framing: creatine isn't only a muscle supplement. The growing cognitive and neurological literature is real and ongoing.

The myths

Loading is required. It isn't. Loading (20g/day in 4 split doses for 5-7 days) saturates muscle stores in about a week instead of three. The end state is the same. Loading often causes mild GI upset; most people skip it and just take 3-5g daily.

Take it post-workout. Timing doesn't matter for chronic adaptation. The body's muscle creatine pool is a daily-average measure; whether you take it at 8 AM or after lifting changes nothing meaningful over weeks of use.

You need to cycle off. No published reason to. The body's endogenous creatine synthesis doesn't permanently downregulate in any clinically relevant way and resumes within days of stopping.

It causes kidney damage. At 3-5g/day in people with normal renal function, no. Long-term studies of athletes consuming creatine for years show no clinically meaningful effect on kidney function. Pre-existing kidney disease changes the calculus; talk to a clinician.^[5] Evidence: A for "safe in healthy adults at standard doses."

Creatine causes hair loss. The 2009 South African rugby study showed a small transient DHT rise; the claim that this causes male-pattern baldness in genetically susceptible men has been widely cited and poorly replicated. The current evidence is suggestive at best and many men have used creatine for decades without observable scalp effects.^[6] Evidence: C for the hair-loss claim; the population data does not support a meaningful effect.

The practical use

1. Take 3-5g of creatine monohydrate daily, every day.
2. Powder is fine, capsules are fine. Mix with water, juice, coffee, anything.
3. Skip loading unless you're impatient.
4. Don't cycle.
5. Track your strength on a few key lifts for 4-6 weeks; the effect should be visible in your numbers.

The cheapest, best-evidenced, most universally beneficial supplement on the shelf. If there were a supplement that deserved "everyone should take this," creatine has the strongest case for it.

FAQ

How much? 3-5g of creatine monohydrate daily, mixed with any beverage. Timing doesn't matter.

Cycle off? No documented reason to.

Hair loss or kidney damage? Neither claim survives scrutiny at normal doses in healthy adults. Pre-existing kidney disease is a real contraindication.

References

1. 1.Kreider RB, et al. (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 14:18. PMC5469049. Link
2. 2.Chilibeck PD, et al. (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 8:213–226. PMID: 29138605. Link
3. 3.Avgerinos KI, et al. (2018). Effects of creatine supplementation on cognitive function of healthy individuals: a systematic review of randomized controlled trials. Experimental Gerontology 108:166–173. PMID: 29704637. Link
4. 4.Roschel H, et al. (2021). Creatine supplementation and brain health. Nutrients 13(2):586. PMID: 33578876. Link
5. 5.Antonio J, et al. (2021). Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show?. Journal of the International Society of Sports Nutrition 18(1):13. PMID: 33557850. Link
6. 6.van der Merwe J, et al. (2009). Three weeks of creatine monohydrate supplementation affects dihydrotestosterone to testosterone ratio in college-aged rugby players. Clinical Journal of Sport Medicine 19(5):399–404. PMID: 19741313. Link