Creatine and Hair Loss: What the Research Can, and Cannot, Tell Us

The hair-loss concern around creatine has circulated for years. Direct evidence now gives the claim a much clearer test.

What the evidence actually shows

Available evidence has not established that creatine causes hair loss. That is different from proving that it could never affect anyone. The most relevant evidence includes one hormone study, a later review and one trial that measured hair directly.

The 2009 study measured DHT, not hair

A small placebo-controlled crossover study in college rugby players used 25 g/day for seven days, followed by 5 g/day for 14 days. Dihydrotestosterone (DHT) increased relative to baseline; testosterone did not. Researchers did not measure shedding, hair density or baldness. This hormone finding cannot establish that creatine caused hair loss. [1]

The 2025 trial measured hair directly

In a randomized trial, 38 resistance-trained men completed 12 weeks of 5 g/day creatine monohydrate or placebo. Researchers measured DHT and testosterone alongside hair density, follicular units and cumulative hair thickness. They found no significant between-group differences in the measured hormone or hair outcomes. [2]

Where the 2021 review fits

The JISSN paper Common questions and misconceptions about creatine supplementation reviewed the earlier hormone evidence and reported that the original DHT finding had not been replicated. It is a narrative review, not a systematic review or another trial measuring hair. It predates the 2025 study. [3]

What we still don’t know

Twelve weeks cannot establish effects over years. The direct trial does not settle the question for women, older adults, higher doses or people with established hair loss. A statistically non-significant result is not proof of zero risk. Several authors disclosed supplement-industry relationships; independent replication would strengthen confidence. [2]

If you notice hair loss

Do not assume the supplement explains it. A dermatologist can assess the pattern, medical history and possible causes, with tests when appropriate. Discuss when the change began and any medicines or supplements you use. [4]