Does creatine raise testosterone or cause hair loss? The gym myth rests on one study

Creatine is the most studied sports supplement on the shelf, and two persistent gym-floor beliefs cling to it: that it works partly by raising testosterone, and that it thins your hair. Neither holds up. The evidence is that creatine leaves testosterone essentially unchanged, and the hair-loss fear rests almost entirely on one small study from 2009 that has never been replicated [s1][s2].

Where the story starts

The single study behind the panic is worth understanding, because it is repeatedly cited as if it settled the question. Researchers gave 20 college-aged rugby players creatine or placebo in a double-blind crossover design: a seven-day loading phase of 25 g per day, then 14 days of a 5 g maintenance dose [s1]. Testosterone did not budge. But dihydrotestosterone — DHT, the more potent androgen implicated in male-pattern baldness — rose by 56% after the loading week and remained 40% above baseline through the maintenance phase [s1]. The ratio of DHT to testosterone climbed 36%, then settled 22% above where it started [s1].

That is a real finding, and it is why the worry exists. But note what the study did and did not show. It measured a hormone in the blood, not hair falling out; the sample was tiny, at 20 men; and the authors themselves called for further investigation rather than declaring creatine a cause of baldness [s1]. They were careful to frame the DHT shift as a hypothesis about mechanism whose long-term safety could not be judged from three weeks of data in a single squad of athletes [s1]. Crucially, in the decade and a half since, no larger trial has reproduced the DHT spike. A finding that stands alone for 15 years, unconfirmed by anyone else, is a hypothesis, not an established effect.

What the wider evidence says

When an international team of creatine researchers reviewed the field to tackle the supplement's most common myths head-on, "Is creatine an anabolic steroid?" and "Does creatine cause hair loss/baldness?" were among the questions they examined against the literature — a body of work spanning more than 500 peer-reviewed publications [s2]. The framing tells you where the science sits: these are catalogued as misconceptions, not confirmed hazards [s2]. Creatine is not a hormone and not a steroid; it is an energy-shuttling compound that helps muscles regenerate their fuel during short, intense efforts, which is why it improves strength and power output without touching the androgen system in the way a steroid would [s2].

On testosterone specifically, that is the consistent message across studies: creatine's performance benefit runs through muscle energetics, not through raising the hormone. The men chasing a "test boost" from a creatine tub are misreading how it works. And the hair question, stripped of the one outlier study, has no weight of evidence behind it — a man predisposed to male-pattern baldness will likely lose hair whether or not he takes creatine, and there is no good trial showing the supplement accelerates it [s1][s2].

How to think about it

None of this makes creatine controversial where it counts. The review notes it is well tolerated at the recommended dose of 3 to 5 g per day, or about 0.1 g per kilogram of body weight, and its benefits for muscle mass, strength and recovery are among the best-documented in all of sports nutrition [s2]. The old fears about kidney damage and dehydration are on the same list of misconceptions the evidence does not support [s2].

So the honest answers: no, creatine will not raise your testosterone, and treating it as a test booster misunderstands the molecule. And no, there is no sound evidence it causes baldness — only a single small study showing a DHT change that nobody has confirmed, and that was never linked to actual hair loss [s1][s2].

That said, evidence can change, and a man who is genuinely worried about his hairline has a reasonable option: stop, wait a few months, and see whether anything changes, since creatine's effects are not permanent. This is an evidence summary rather than personal advice, and anyone with a medical condition should check supplements with a clinician. But the specific claims that creatine juices testosterone or thins hair should be filed where they belong — as gym folklore that the data do not back [s1][s2].

Sources

• [s1] Three Weeks of Creatine Monohydrate Supplementation Affects Dihydrotestosterone to Testosterone Ratio in College-Aged Rugby Players — Clinical Journal of Sport Medicine, 2009
• [s2] Common questions and misconceptions about creatine supplementation: what does the scientific evidence really show? — Journal of the International Society of Sports Nutrition, 2021