The claim that creatine causes hair loss traces back to a single small study from 2009 and has been repeated millions of times since without much scrutiny of what the study actually measured. The study did not measure hair loss. It measured DHT levels in a blood test. The inference that elevated DHT leads to hair loss requires additional steps that the study itself never took. Understanding what the evidence actually shows, rather than what the internet says about it, clarifies both the real finding and its limitations.
The 2009 van der Merwe Study
The paper that launched the creatine-hair loss concern was published in Clinical Journal of Sport Medicine by van der Merwe et al. in 2009. It enrolled 20 college-age male rugby players in a randomized, double-blind crossover design. Participants received creatine loading (25g/day for seven days, then 5g/day for 14 days) or placebo.
The key finding: DHT levels increased by 56% in the creatine group during the loading phase and remained approximately 40% above baseline during the maintenance phase. The DHT-to-testosterone ratio also increased, suggesting increased conversion of testosterone to DHT rather than simply elevated testosterone.
What the study did not measure: hair loss, hair follicle miniaturization, or any clinical outcome related to hair. The jump from “DHT increased” to “creatine causes hair loss” is an inference that has never been tested in a controlled clinical trial.
Why the Study Received So Much Attention
The DHT increase was substantial. DHT is the androgen responsible for androgenetic alopecia through follicle miniaturization. If creatine raises DHT by 56%, and DHT drives hair loss in genetically susceptible men, then creatine plausibly accelerates hair loss in men who would experience it anyway.
This is a mechanistically coherent hypothesis. It is not the same as documented evidence.
What Subsequent Research Shows
Multiple studies have attempted to replicate the DHT elevation finding with mixed results:
A 2021 study in the Journal of the International Society of Sports Nutrition measured testosterone and DHT in men supplementing with creatine for 21 days. It found no significant change in testosterone or DHT levels compared to placebo.
Several other trials measuring hormonal effects of creatine have not found DHT elevation. The van der Merwe finding has not been consistently replicated.
Why the inconsistency? The original study was small (10 subjects per group), used a loading protocol rarely used today, was conducted in a specific athletic population, and used a specific assay methodology. Whether the DHT finding was real, a measurement artifact, or specific to that population and protocol is unknown.
What This Means for Men Concerned About Hair Loss
For men without androgenetic alopecia or with low genetic susceptibility, the creatine-hair loss concern has very little practical relevance. Even if creatine does raise DHT in some contexts, DHT only causes hair loss in follicles genetically predisposed to miniaturization. Elevated DHT in a man without the genetic predisposition has no effect on his hair.
For men who are already experiencing male pattern hair loss or have a strong family history of it, the concern is more plausible but still unconfirmed by clinical evidence. The question of whether creatine accelerates existing androgenetic alopecia in susceptible men cannot be answered with current evidence.
Given creatine’s well-established benefits, it is the most consistently effective legal performance supplement with decades of safety data, men who are worried about hair loss but want creatine’s benefits face a genuine tradeoff between a well-documented benefit and an unconfirmed risk.
Practical Considerations
Men taking finasteride or dutasteride for hair loss who also use creatine are partially protected from any potential DHT-driven acceleration, because these drugs suppress DHT production regardless of how much testosterone is converted by 5-alpha reductase.
Men using minoxidil alone without 5-alpha reductase inhibitors would not have this protection.
The honest answer: the creatine-hair loss connection remains a plausible hypothesis from one small study, not a confirmed clinical finding. Men deeply concerned about hair loss who want to avoid any theoretical risk can omit creatine. Men who are less concerned or who are taking DHT-blocking medication do not have a strong evidence-based reason to avoid it.
For context on the DHT mechanism of hair loss, see The 7 Stages of Male Pattern Baldness Explained. For the evidence on DHT-blocking treatments, see Finasteride Side Effects: What the Research Actually Shows.
