Creatine: Does It Actually Work?
With over 500 peer-reviewed studies, creatine monohydrate is the most researched sports supplement in existence — and one of the very few with unambiguous, consistent evidence behind it. The International Society of Sports Nutrition (ISSN) rates it as the most effective ergogenic nutritional supplement for increasing high-intensity exercise capacity and lean body mass.
What creatine actually does
Creatine is a naturally occurring compound made from the amino acids glycine, arginine, and methionine. Your body produces about 1–2g/day; you get another 1–2g/day from red meat and fish. Muscles store it as phosphocreatine (PCr).
During maximum-intensity efforts lasting 1–10 seconds — a sprint, a heavy lift, an explosive jump — your muscles rely on the PCr system to regenerate ATP (energy). Supplementation saturates muscle PCr stores by 15–40% above dietary baseline, allowing you to:
- →Do 1–2 more reps on heavy compound lifts before failure
- →Sprint harder for longer before power drops off
- →Recover faster between sets (PCr re-synthesis speeds up)
- →Train at higher volumes over weeks and months
What the research shows
Strength gains
A 2003 meta-analysis in the Journal of Strength and Conditioning Research found creatine supplementation increases 1RM strength by ~8% and repetition volume by ~14% compared to placebo. The effect is consistent across age groups.
Lean mass
Creatine users gain on average 1–2 kg more lean mass over 4–12 weeks of resistance training compared to placebo. Part of this is intramuscular water retention (creatine is osmotically active); part is genuine muscle protein accretion from higher training volumes.
Cognitive function
Emerging research shows creatine may support brain function, particularly in sleep-deprived individuals and older adults. The brain uses significant amounts of PCr for cognitive tasks. Studies show 5g/day for 6 weeks improved working memory in vegetarians and older adults.
Safety
Long-term studies (up to 5 years) show no adverse effects on kidney function in healthy individuals. The myth that creatine damages kidneys comes from a single case study from 1998 involving a patient with pre-existing kidney disease. The ISSN position stand (2021) states creatine monohydrate is safe for healthy adults at recommended doses.
Who responds — and who doesn't
Roughly 25–30% of people are "non-responders" — their muscles don't retain creatine well due to already high natural levels or genetic muscle fibre composition. Non-responders tend to eat more red meat. If you try creatine for 4 weeks and notice no benefit in recovery or performance, you may be a non-responder.
Responders are typically: vegetarians and vegans (lowest dietary baseline), younger people, those with higher proportions of fast-twitch muscle fibres, and people in early stages of resistance training.
The optimal protocol
Loading Phase (optional)
0.3g/kg/day for 7 days, split into 4 doses. Saturates muscles in 7 days. Skip if you prefer slower results — maintenance dose alone saturates in 3–4 weeks.
Maintenance Phase (ongoing)
0.03g/kg/day — typically 3–5g for most adults. Take daily, including rest days. No need to cycle on and off.
Timing matters less than consistency. Post-workout has a marginal advantage in some studies, but daily use is what drives the effect. Take with carbohydrates and protein to slightly improve uptake via insulin-mediated transport.
Which form to buy
Creatine monohydrate is the cheapest, most researched, and most effective form. Alternatives like creatine HCl, buffered creatine (Kre-Alkalyn), and creatine ethyl ester cost more and have no superior evidence. The International Society of Sports Nutrition explicitly recommends monohydrate as the reference standard.
Look for a product third-party tested (Informed Sport, NSF Certified for Sport) if you compete in tested sports. Micronised creatine mixes more easily in water but is otherwise identical.
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