The Number Behind the Fear
If you have ever typed "does creatine cause hair loss" into a search bar, you have probably run into one study. In 2009, researchers at a South African rugby institute reported that dihydrotestosterone (DHT) rose 56% after a 7-day creatine loading phase of 25 g/day. On a 5 g/day maintenance dose, DHT stayed roughly 40% above baseline. Total testosterone did not move.
DHT is the more potent androgen derived from testosterone, and it is the hormone most closely tied to male-pattern baldness in genetically susceptible men. So a supplement that raises DHT by that much sounds alarming. But what the study actually showed is narrower than the internet's retelling of it, and the gap between those two things matters.
What the Researchers Actually Did
The paper, by van der Merwe and colleagues in the Clinical Journal of Sport Medicine, was a double-blind, placebo-controlled crossover trial. Twenty college-aged rugby players took part during their competitive season. Each completed both conditions, separated by a 6-week washout.
The creatine protocol was a standard one:
- Loading: 25 g/day creatine plus 25 g/day glucose for 7 days
- Maintenance: 5 g/day creatine plus 25 g/day glucose for 14 days
- Placebo: 50 g/day glucose, then 30 g/day glucose
Serum testosterone and DHT were measured at baseline, day 7 and day 21, along with body composition.
The results were consistent. Testosterone was unchanged. DHT rose 56% after loading and stayed 40% higher after two weeks of maintenance (P < 0.001). The DHT:testosterone ratio climbed 36% after loading and remained 22% elevated after maintenance (P < 0.01). The authors suggested creatine may act partly by increasing the conversion of testosterone to DHT, and called for further investigation into long-term safety.
What the Study Did Not Show
Here is the part that rarely makes it into forum threads: nobody measured hair loss. The study tracked blood hormones and body composition, not hair density, shedding, hairline recession or any dermatological outcome. The leap from "DHT went up" to "you will go bald" is an inference, not a finding.
There are other limits worth stating plainly:
- Small sample. Twenty young male athletes is a modest group.
- Short duration. Three weeks says little about what happens over months or years.
- Specific population. These were rugby players in a competitive season, with the training stress and hormonal noise that implies.
- Circulating DHT only. Serum levels do not necessarily reflect DHT activity at the scalp, where local enzyme activity and follicle sensitivity matter a great deal.
Also important: later research has not consistently replicated the DHT rise. Some trials looking at creatine and androgens have found no meaningful change in DHT or the DHT:testosterone ratio. This single study remains the most-cited piece of evidence, but it has not hardened into settled science.
Why DHT Matters for Hair, and Why It Is Not the Whole Story
Male-pattern hair loss depends on two ingredients: circulating androgens and an inherited sensitivity of scalp follicles to DHT. Men without that genetic predisposition can have normal or even high DHT and keep their hair. Men with the predisposition can lose hair at fairly average hormone levels.
That is why drugs like finasteride, which block the enzyme converting testosterone to DHT, work for many men. It also explains why a rise in serum DHT, even a real one, does not translate automatically into thinning for everyone. The plausible concern is for people already on the edge: a man with a strong family history of baldness might, in theory, see an existing process speed up if his DHT truly runs higher. That is a hypothesis, and it remains unproven for creatine.
Loading vs. Maintenance: What It Means in Practice
The study used the classic loading approach: roughly 20-25 g/day for a week to saturate muscle stores quickly, then 3-5 g/day to maintain them. The sharpest DHT change appeared during loading, though the elevation persisted on the lower dose.
Loading is not required for creatine to work. Taking 3-5 g/day without loading gets muscle creatine to similar levels in about three to four weeks. The trade-off is simply speed.
Who Might Want to Pay Attention
Most lifters have little reason to panic. But a few groups might reasonably think it through:
- Men with a strong family history of male-pattern baldness, especially those already noticing early thinning
- Anyone already using or considering DHT-blocking treatments, who may want to discuss supplementation with a clinician
- People who are simply cautious and prefer not to introduce a variable with uncertain long-term effects
If you fall into one of those groups, practical options include skipping the loading phase, staying at 3 g/day, or monitoring your hairline and shedding over time. If you notice changes, you can stop and reassess. The benefits of creatine for strength, lean mass and training performance are among the best-supported in sports nutrition, so weighing them against a speculative risk is a personal call.
The Bottom Line
The 2009 rugby study is a genuine finding: creatine raised DHT substantially while leaving testosterone alone. It is also a small, short trial that never looked at hair, and later work has not reliably reproduced the effect. The honest summary is "possible mechanism, unproven outcome." For most people, that does not outweigh creatine's well-documented benefits, but men with a genetic predisposition have a reasonable case for a more conservative approach.
