The Origin of the Creatine–Hair Loss Claim
The hair loss concern traces back to a single 2009 study by van der Merwe et al. on 20 college rugby players in South Africa. The study found that after 3 weeks of creatine loading followed by maintenance, DHT (dihydrotestosterone) levels increased by 56%, and the DHT:testosterone ratio increased by 36%.
Since DHT is implicated in androgenic alopecia (male pattern baldness), the study sparked widespread concern online.
Problems with the Study
Before panicking, here's what the study didn't show:
- DHT stayed within normal range throughout. None of the participants had DHT outside clinical norms at any point.
- No hair loss was measured or reported. The study only measured hormone levels — not actual hair shedding or follicle miniaturization.
- The study was never replicated. Despite widespread interest, no follow-up study has confirmed the DHT-elevating effect of creatine.
- n=20 is tiny. Small sample studies often produce results that fail to replicate.
What Is DHT and How Does It Cause Hair Loss?
DHT is a metabolite of testosterone formed via the enzyme 5-alpha reductase. In people with androgenic alopecia (genetic predisposition), DHT binds to hair follicle receptors and gradually shrinks them — a process called follicle miniaturization — leading to thinner, shorter hairs and eventually complete follicle shutdown.
Critically: DHT only causes hair loss in people who are genetically predisposed to androgenic alopecia. If you have no family history of male pattern baldness, elevated DHT will not cause hair loss.
What the Broader Research Shows
Large-scale studies on creatine supplementation lasting months to years have not identified hair loss as an adverse effect. The ISSN's comprehensive review — covering hundreds of studies — does not list hair loss among creatine's side effects.
A 2021 review of creatine's safety profile concluded that existing evidence does not support a causal link between creatine supplementation and hair loss.
The Risk Assessment
Based on the current evidence:
- If you have no family history of baldness: Essentially no concern.
- If you have mild family history: Theoretical low risk. The evidence doesn't confirm it, but the 2009 DHT finding isn't fully disproved either.
- If you're already experiencing androgenic alopecia: Theoretical moderate concern. Consider discussing with a doctor, though there's no direct causal evidence.
Bottom Line
The creatine–hair loss link is one of the most persistent myths in sports nutrition. The evidence is: one small unreplicated study showing DHT elevation, no studies showing actual hair loss, and no biological mechanism confirmed. The scientific consensus is that creatine does not cause hair loss based on available evidence.
- van der Merwe J et al. (2009). Three weeks of creatine monohydrate supplementation affects dihydrotestosterone. Clinical Journal of Sport Medicine.
- Diemer C et al. (2021). Hair growth effects of oral supplementation. Dermatology and Therapy (review).
- Kreider RB et al. (2017). ISSN Exercise & Sport Nutrition Review Update. JISSN.