Creatine is arguably the most extensively studied supplement in sports nutrition, with a genuinely strong evidence base behind it, and it is also surrounded by more myths than most other supplements on the market, including some that persist among people who should know better.
What creatine actually is and does
Creatine is a compound your body produces naturally and also obtains from meat and fish, stored primarily in muscle where it helps regenerate ATP, the immediate energy currency your muscles use for short, powerful bursts of effort. Supplementing increases muscle creatine stores beyond what diet alone typically provides, which is the mechanism behind its effects.
What the evidence actually supports
Creatine supplementation reliably improves performance in short-duration, high-intensity activities — weightlifting, sprinting, jump-based sports — and, combined with resistance training, supports greater gains in muscle mass and strength compared with resistance training alone. This is one of the more consistent, well-replicated findings in all of sports nutrition research, not a marginal or contested effect.
Emerging evidence beyond athletic performance
More recent research has explored creatine's potential roles in cognitive function, particularly under conditions of sleep deprivation or mental fatigue, and in supporting muscle mass preservation in older adults when combined with resistance training. This research is genuinely promising but still developing, and is a meaningfully different evidence base than the well-established performance and muscle-building effects, which are considered settled.
Addressing the kidney damage myth directly
This is one of the most persistent misconceptions about creatine, and it does not hold up against the evidence. Multiple studies, including long-term ones, have found no evidence of kidney damage from creatine supplementation in healthy individuals at standard doses. The myth likely originated partly from creatine modestly raising blood creatinine — a marker normally used to assess kidney function — through an unrelated mechanism specific to creatine metabolism, not through actual kidney damage. This can confuse an unaware doctor reading a routine blood panel, which is worth mentioning to your doctor if you supplement, purely so the number is interpreted correctly rather than because of any real kidney risk.
Who genuinely benefits most
Anyone doing resistance training regularly, where the muscle and strength gains are best established. Athletes in sports involving repeated short bursts of high effort. Vegetarians and vegans, who have lower baseline creatine stores from diet alone and sometimes see a more noticeable initial response to supplementation as a result.
The practical dosing that the evidence actually supports
A simple daily dose of 3 to 5 grams of creatine monohydrate, taken consistently, is the well-supported standard approach — timing relative to workouts matters far less than consistent daily intake, since the benefit comes from saturated muscle stores over time, not from an acute dose immediately before training. Elaborate loading phases and cycling protocols marketed by some supplement companies are not necessary for the vast majority of people; they may modestly speed up the initial saturation timeline but do not change the eventual outcome.
Which form actually matters
Creatine monohydrate is the most extensively studied form, is the form used in the overwhelming majority of the supporting research, and is also typically the least expensive. More expensive alternative forms marketed as superior generally lack evidence to support the added cost and claimed advantages.
The honest summary
For most people doing resistance training, creatine monohydrate is a well-evidenced, safe, and inexpensive supplement worth considering — the kidney concern specifically does not hold up in healthy individuals, though anyone with pre-existing kidney disease should discuss it with their doctor first given their different baseline risk.
This article is general education and not personalized medical advice. If you have kidney disease or another condition affecting kidney function, talk to your doctor before starting creatine.