Creatine monohydrate is the most evidence-backed sports supplement in existence. It increases phosphocreatine stores in muscle, enhancing the rapid energy system (ATP-PCr) used in high-intensity, short-duration efforts. Benefits for strength, power and muscle mass are well-established across decades of research. Emerging evidence also suggests cognitive benefits.
Creatine monohydrate works. The evidence for strength and power output is among the strongest in sports nutrition. It is safe, cheap and effective — the main debate now is whether non-athletes can also benefit cognitively.
Each row grades the claimed effect by strength of human evidence, not mechanism or marketing.
One of very few sports supplements with near-universal endorsement from sports science bodies. International Society of Sports Nutrition rates it as safe and effective.
Widely used and generally accurately characterised — creatine is one of the few supplements where community understanding broadly aligns with evidence.
The main areas of emerging debate are cognitive applications, mental health benefits, and optimal protocols for older adults. Hair loss concern exists anecdotally but lacks RCT confirmation.
Creatine monohydrate is the most-studied form and there is no replicated evidence that other forms (ethyl ester, HCl, buffered) outperform it.
Loading (20 g/day for 5–7 days) saturates stores faster but 3–5 g/day reaches the same endpoint in 3–4 weeks.
Vegetarians and vegans typically have lower baseline muscle creatine and see larger performance responses.
Creatine does not damage kidneys in healthy people — this myth stems from the fact that creatine metabolism raises creatinine, a kidney biomarker, but this is not the same as kidney damage.
The initial weight gain (1–3 kg) on creatine is intramuscular water retention — not fat, not oedema.
Mechanism is not outcome. Each mechanism is labelled by how far it has been validated in humans.
Creatine increases the phosphocreatine pool in muscle, allowing faster resynthesis of ATP during high-intensity efforts lasting 1–30 seconds.
Creatine draws water into muscle cells, increasing cell volume — a signal associated with anabolic processes and potentially contributing to muscle protein synthesis.
Creatine supplementation combined with resistance training enhances satellite cell activity and myosin heavy chain expression in muscle.
The brain also uses the creatine-phosphocreatine system for energy buffering. Supplementation increases brain creatine, particularly in those with low baseline (vegetarians, sleep-deprived).
Decades of research in healthy adults show no clinically significant safety concerns at standard doses. One of the most studied and consistently safe supplements.
This page is educational and not medical advice. If you have pre-existing kidney conditions or are on medication, discuss with a clinician before use.
A small, curated set — not a literature dump. Each reference comes with a single-line takeaway.
Creatine is the most effective ergogenic nutritional supplement for athletes. Monohydrate is the most studied and effective form.
Creatine supplementation consistently improves maximal strength and weightlifting performance across studies.
Reviews evidence that creatine increases brain phosphocreatine and may support cognitive performance, particularly under metabolic stress.
21 months of creatine supplementation did not adversely affect kidney function, liver enzymes or other clinical markers.