For how we live.
The whole scare traces to one 2009 study that measured a hormone, not hair. In 2025, the first trial to actually assess hair follicles found no difference between creatine and placebo.
A meta-analysis of 26 trials found creatine raises serum creatinine without markers of kidney injury. Weeks earlier, a Nature Communications paper reported that supplementation promoted metastasis in mice.
A meta-analysis of eleven depression trials found an average effect below the threshold for clinical importance, with signs of bias favouring creatine. A separate review found no change in kidney filtration.