Can creatine harm the kidneys?
Going by the presently available evidence, the answer is no. One case report describes a bodybuilder who was taking creatine and had kidney failure, but he was taking 200 g a day along with high doses of anabolic steroids. Every study done in humans on the subject, including controlled studies on athletes who have been taking creatine for up to five years, have found no effect on markers of kidney function at all. It is possible that creatine could pose a problem in individuals that already have impaired kidney function.
