Why people believe this

The theory is not irrational. Testosterone can be converted by the enzyme 5-alpha-reductase into dihydrotestosterone (DHT). DHT is involved in androgenetic alopecia because genetically susceptible scalp hair follicles can gradually miniaturise in response to androgen signalling.

That creates a plausible chain:

But biological plausibility is not the same thing as proof. A mechanism can be possible without creating a meaningful real-world effect.

The study that started the concern

Participants used a loading phase of 25 g of creatine per day for seven days, followed by 5 g per day for another 14 days.

The researchers measured testosterone and DHT. They reported that DHT increased above baseline during the creatine condition.

That finding is the main reason the hair-loss claim became so widespread.

However, several details matter:

• The study was small.
• It lasted only three weeks.
• DHT was the outcome — hair loss was never measured.
• The result has not become a consistent finding across subsequent creatine research.

The study therefore showed a hormonal signal worth investigating. It did not show that creatine caused baldness.

What does the evidence show?

A 2021 evidence review examined common creatine safety claims, including the proposed link with hair loss. The authors noted that the 2009 DHT finding had not been successfully replicated and that studies examining creatine and androgen hormones generally did not show meaningful increases in testosterone or free testosterone.

For years, though, one major gap remained: researchers had mostly measured hormones rather than the hair itself.

The first trial to directly measure hair

This study was much closer to the question people actually care about. Researchers measured:

• DHT
• total testosterone
• free testosterone
• DHT-to-testosterone ratio
• hair count and density
• follicular units
• terminal and vellus hairs
• cumulative hair thickness

After 12 weeks, the researchers found no significant difference between creatine and placebo in DHT and no creatine-related deterioration in measured hair outcomes.

The strongest evidence

The evidence base for creatine overall is large, but the specific question of hair loss still has surprisingly little direct research.

The best current picture is:

• 2009: one small trial found an increase in DHT after a high-dose loading phase, but did not measure hair.
• 2021 review: the wider creatine literature did not show a consistent androgen effect or establish a link with baldness.
• 2025 direct trial: creatine did not worsen DHT or objective hair measurements over 12 weeks.

Taken together, the evidence points much more strongly toward no demonstrated hair-loss effect than toward creatine causing baldness.

The catch

The 2025 study is reassuring, but it does not answer every possible question.

• It was relatively small. Only 38 participants completed the study.
• It lasted 12 weeks. Androgenetic alopecia develops gradually, so longer studies would be valuable.
• The participants were men aged 18–40. Results cannot automatically be assumed to apply identically to every population.
• Genetic susceptibility matters. Future work in people strongly predisposed to androgenetic alopecia would be especially informative.
• Dosing differed across studies. The 2009 study used a loading phase; the 2025 study used 5 g/day without loading.

So the evidence does not justify saying an effect is impossible in every person over many years. It does justify saying that the claim that creatine causes hair loss has not been demonstrated.

What this means for you

If you take a typical maintenance dose of 3–5 g of creatine monohydrate per day, the current evidence does not provide a good reason to expect it to cause hair loss.

The famous connection between creatine and baldness did not begin with researchers watching people lose their hair. It began with one small study detecting an increase in a hormone associated with androgenetic alopecia.

The best direct trial we now have measured both the hormone and the hair itself — and found no meaningful difference between creatine and placebo over 12 weeks.

If you are already losing hair, however, androgenetic alopecia is common and strongly influenced by genetics. Hair loss happening while someone takes creatine does not by itself prove that creatine caused it.

Research & Sources

Evidence reviewed: September 2026

Evidence vs Hype explains scientific research for educational purposes and does not provide individual medical diagnosis or treatment.