Creatine monohydrate is, by a wide margin, the most researched performance supplement that exists. Decades of trials point to the same conclusion: it modestly but reliably increases strength, power output, and lean mass when combined with resistance training, and it does this safely for the overwhelming majority of healthy adults. It's also one of the few supplements where the cheapest option is usually just as effective as the expensive one — which makes picking the right product mostly a question of purity and dosing convenience, not marketing.
What It Actually Does
Creatine increases the amount of phosphocreatine stored in muscle tissue, which your body uses to rapidly regenerate ATP during short, intense efforts — think sets of 1–12 reps, sprints, or jumps. More available phosphocreatine means you can push slightly harder for slightly longer before fatiguing, and that small edge compounds into meaningfully more training volume over weeks and months. It is not a stimulant, has no acute "feel" the way caffeine does, and its benefits show up in performance and body composition over time rather than in how you feel on any single day.
Dosing: Simpler Than It Sounds
You don't need a loading phase. Taking 20g/day split into doses for a week saturates your muscle stores faster, but a flat 3–5g daily gets you to the same saturation point within three to four weeks and is what most people should actually do — it's easier to stick with and avoids the mild digestive discomfort some people report during loading. Timing relative to your workout doesn't meaningfully matter; consistency does.
What to Look For in a Product
Creapure-certified creatine monohydrate is the benchmark for purity — it's manufactured in Germany under quality standards that minimize contaminants like dicyandiamide and creatinine that can appear in cheaper, unregulated creatine. Micronized creatine dissolves more easily in liquid, which matters for mixability but not for effectiveness — it's the same molecule, just a finer particle size. Third-party testing (NSF Certified for Sport or Informed Sport) matters most for competitive athletes subject to drug testing, since it confirms the product isn't contaminated with banned substances.
Skip anything marketed as a "next-generation" or proprietary creatine form — buffered creatine, creatine ethyl ester, and similar variants have been tested head-to-head against plain monohydrate and have never shown a meaningful advantage, usually at a higher price.
Who Should Be Cautious
Creatine is well-tolerated by the vast majority of healthy adults, including older adults, where it may help offset age-related muscle loss when combined with resistance training. The main caveat: people with pre-existing kidney disease should talk to a doctor before starting, since creatine increases creatinine levels (a marker doctors use to assess kidney function), which can complicate — though doesn't necessarily indicate — kidney monitoring.
