The short answer
Creatine is one of the most studied supplements in sports nutrition, and the hair loss worry rests on a surprisingly thin foundation: a single small study from 2009 that measured a hormone linked to hair loss, but not hair. When researchers finally measured hair directly in a randomized trial, creatine made no difference.
That does not mean every man on creatine will keep his hair. Male pattern hair loss is common and largely genetic, and many men who lift and take creatine will lose hair anyway. The evidence simply does not point to creatine as the reason.
The 2009 rugby study that started it
The myth traces back to a 2009 study of 20 college-aged rugby players in South Africa. In a double-blind crossover design, the players took either creatine or a glucose placebo. The creatine phase started with a loading period of 25 grams a day for 7 days, followed by 5 grams a day for 14 days.
Testosterone did not change. But dihydrotestosterone (DHT), a more potent hormone made from testosterone, rose by 56% after the loading week and stayed 40% above baseline after the maintenance phase. The ratio of DHT to testosterone rose by 36% and then 22%.
Because DHT is the hormone most closely tied to male pattern baldness, the leap was quick: if creatine raises DHT, maybe it causes hair loss. The authors themselves suggested creatine might speed the conversion of testosterone to DHT and called for more research. They did not study hair.
Why that study cannot answer the question
Several features limit what it can tell us:
| Limitation | Why it matters |
|---|---|
| No hair measurements | DHT changes do not automatically translate into hair loss |
| 20 participants | Small studies are easily swayed by chance |
| Three weeks long | Pattern hair loss develops over years |
| Loading dose of 25 g a day | Higher than the 5 g a day many men take |
| DHT stayed in the normal range | A rise within normal limits is not the same as a high level |
| Not replicated | Later studies measuring androgens did not find the same pattern |
A 2021 review of common creatine misconceptions looked closely at the rugby data. It noted that DHT and the DHT-to-testosterone ratio stayed well within normal clinical limits, that the creatine group happened to start with DHT about 23% lower than the placebo group, and that no study had reported hair loss in humans taking creatine. Across the other studies it reviewed, creatine did not increase total testosterone, free testosterone or DHT.
What happened when someone measured hair
In 2025, researchers ran the trial the debate had been missing. In a 12-week randomized controlled trial, 45 resistance-trained men aged 18 to 40 took either 5 grams of creatine monohydrate or 5 grams of a placebo daily. The team measured testosterone, free testosterone and DHT, and assessed hair directly with a trichogram and a scalp imaging system that tracks hair density, follicular units and hair thickness.
Thirty-eight men finished. There were no meaningful differences between the creatine and placebo groups in DHT, the DHT-to-testosterone ratio or any hair measure. Testosterone moved over the 12 weeks in both groups, but not because of creatine.
It is fair to note the limits here too. Twelve weeks is still short compared with the years over which pattern loss develops, and several authors disclosed advisory or research ties to supplement companies. But it is the only study to look at hair itself, and it found nothing.
What actually drives male pattern hair loss
MedlinePlus Genetics explains that male pattern hair loss is tied to DHT, that variations in the androgen receptor gene are confirmed to play a part, and that many genetic and environmental factors are likely involved. It notes that variations in that gene appear to make the receptors in hair follicles more easily stimulated by androgens, which is why inheritance matters so much.
That is why treatments work on the follicle’s response rather than on supplements. Finasteride, a 5-alpha reductase inhibitor, blocks the body’s production of the hormone in the scalp that shrinks follicles, and it works only while you take it. The AAD notes that finasteride slows further hair loss in about 80% to 90% of men taking it, that results appear in about six months, and that some men report sexual side effects that can continue after stopping, which is why a careful history comes first. Our page on finasteride for hair loss covers the trade-offs.
Signs that point to pattern loss rather than a passing phase:
- Recession at the temples that deepens over a year or two
- Thinning at the crown that shows in overhead photos
- Hairs that grow back finer and shorter than before
- A father, grandfather or uncle with the same pattern
If you are in your 20s and noticing a receding hairline, our page on early hair loss in your 20s explains what is typical and when to act. For other beliefs that do not hold up, see our article on hair loss myths men believe.
A note for men on testosterone therapy
Testosterone therapy is a different question from creatine. Raising testosterone can increase DHT, and men who are genetically prone to pattern loss may notice it progress. Our article on low testosterone, TRT and DHT explains that relationship, and the page on creatine on TRT covers combining the two.
How Ultimate Male approaches hair loss
If your hair is thinning, keep the focus on the cause rather than the supplement shelf. Our hair restoration service at San Gabriel and Downey starts with a look at the pattern, your family history and, when shedding is part of the picture, labs for iron, zinc, thyroid and vitamin D.
From there, a provider can discuss PRP, which concentrates your own platelets and injects them into thinning areas. PRP for hair is not FDA-approved, and evidence is mixed to promising, so it is offered as one option alongside the established medicines, not as a replacement for them. Our comparison of PRP and finasteride helps you weigh the two. Questions about your own hairline can start with a free 10-minute call at 626-319-5261.
