What it's actually good for
Creatine monohydrate is the most-studied sports supplement in history, and it's one of the few where the evidence actually matches the claims. Your body naturally produces creatine and stores it in muscle as phosphocreatine, which serves as a rapid energy reserve for high-intensity efforts. Supplementation increases these stores by about 20-40%, which translates to real, measurable improvements in strength, power, and lean mass.
What's genuinely interesting is the emerging evidence for cognitive benefits. Your brain is metabolically expensive — it uses creatine too — and the idea that supplementation might buffer cognitive performance under stress is supported by a growing number of controlled trials.
What the research says
Strength and power (Grade A). This is about as settled as sports nutrition gets. The International Society of Sports Nutrition's position stand, drawing on hundreds of studies, concludes that creatine monohydrate is the most effective nutritional supplement for increasing high-intensity exercise capacity and lean body mass during training. Typical improvements are 5-15% in strength and power output. The effect is real, reproducible, and consistent across age groups.
Cognitive function (Grade B — promising, not proven). A 2018 systematic review of 6 RCTs found that creatine improved short-term memory and reasoning, with the largest effects under conditions of stress — sleep deprivation and mental fatigue. The literature is smaller and the effects more variable than for physical performance, but the mechanistic rationale is sound (the brain uses creatine for ATP regeneration) and the direction of evidence is encouraging. This is a B, not an A, because we need more and larger trials.
Recovery and fatigue (Grade B). Meta-analyses suggest creatine modestly reduces markers of exercise-induced muscle damage and may speed recovery between training sessions, though the practical magnitude of this effect is smaller than the strength benefits.
How much, and which form
3-5 g/day of creatine monohydrate is the standard recommendation and what most research uses. You can load (20 g/day for 5-7 days) to saturate stores faster, but daily dosing reaches the same saturation point in about 3-4 weeks. Timing doesn't matter much — consistency matters more.
Creatine monohydrate is the form to use. Other forms (HCl, buffered, ethyl ester) cost more and have no proven advantage. This is not a matter of opinion — monohydrate has orders of magnitude more supporting research than any alternative.
Safety & interactions
Creatine has an excellent safety profile across hundreds of studies. The persistent myth that it damages kidneys is not supported by evidence in healthy individuals — it can raise creatinine levels (a marker used to estimate kidney function), but this is a measurement artifact, not kidney damage. People with pre-existing kidney disease should consult a physician.
Expect a modest weight increase of 1-2 kg from increased intracellular water retention. This is normal and expected — it's not "bloating" in the negative sense. This is informational, not medical advice — check with a clinician before starting.
How we picked the brand
A creatine product earns a spot when it uses pure creatine monohydrate (Creapure or equivalent), avoids unnecessary additives and proprietary blends, passes independent third-party testing (NSF Certified for Sport / Informed Sport / USP), and accurately labels its contents.