There isn’t much to indicate that creatine supplementation actually causes hair loss. In fact, much of the evidence for the link is anecdotal. This means that it comes from people’s personal testimony or experiences.
However, a small 2009 studyTrusted Source in college-age rugby players found increased levels of a hormone associated with hair loss following 3 weeks of a creatine supplementation regimen. This hormone is called dihydrotestosterone (DHT).