Does Creatine Cause Hair Loss? The Single Study Behind the Myth

There is a specific ritual that plays out in gym locker rooms and group chats every week: a man in his early twenties, three months into a new training program, tilts his phone camera toward his hairline and asks the internet a nervous question. Somewhere in the replies, someone always says it. Dude, it’s the creatine.

That reply has been copied and pasted, in one form or another, since 2009. It comes from one small experiment on South African rugby players: a study that lasted three weeks, involved 20 people, and never looked at a single hair.

Sixteen years and dozens of studies later, the science has moved on. The internet mostly hasn’t. So let’s do what the comment sections won’t: read the original study, look at what came after it, and give an honest answer about one of the most-used supplements in sports nutrition.

Where did the creatine hair loss myth come from?

Trace almost every article, forum thread, and worried video on this topic backward and you land in the same place: a 2009 paper from Stellenbosch University in South Africa, published in the Clinical Journal of Sport Medicine. Researchers gave college-aged rugby players creatine for three weeks, a brief high-intake loading phase followed by a smaller maintenance amount, and drew blood along the way.

The players’ testosterone didn’t budge. But a related hormone called dihydrotestosterone, or DHT, rose noticeably: roughly 56 percent above baseline after the loading week, settling to about 40 percent above baseline two weeks later. Because DHT is the hormone most strongly tied to male-pattern baldness, the finding traveled fast. A blood test result became a headline, the headline became a rumor, and the rumor calcified into gym-floor gospel.

Here is the detail that almost never makes it into the retelling: the study did not measure hair. Not hair counts, not shedding, not follicle size, not a single photograph of a scalp. It measured a hormone for 21 days in 20 young men and stopped there. Everything about hair loss was inference layered on top of that: a hypothesis, not a finding.

That distinction matters more than it might seem. Plenty of things nudge hormone levels temporarily without changing anything you can see in the mirror. Whether this one did was, for a long time, simply unknown. It is much less unknown now.

What the 2009 rugby study actually found

The details are worth a careful look, because they are both more interesting and less alarming than the summary that circulates online.

• Who: 20 college-aged male rugby players in a double-blind, placebo-controlled crossover design, meaning each participant served in both the creatine and placebo arms with a washout period between.
• How long: 21 days total per arm, one week of loading, two weeks of maintenance.
• What changed: Serum DHT rose about 56 percent after loading and remained roughly 40 percent above baseline through day 21. The ratio of DHT to testosterone also shifted upward.
• What didn’t: Total testosterone stayed flat. And critically, every DHT value recorded, before, during, and after, remained within the normal clinical reference range for healthy young men.

That last point deserves a plain-English translation. Normal DHT levels in men span a wide band, and a 40 to 56 percent swing within that band is the kind of movement hormones make for many reasons, including intense training itself, time of day, and simple measurement variability. A man whose DHT rises from the lower-middle of the normal range to the upper-middle has not entered dangerous territory; he has moved around inside the same room.

None of this makes the study bad. It was a legitimate, peer-reviewed experiment that asked a fair question. The problem was never the study: it was the weight the internet asked 20 rugby players and three weeks of blood draws to carry.

What is DHT, and why did one blood test scare so many people?

DHT is what happens when an enzyme called 5-alpha reductase converts testosterone into a more potent form. It plays a legitimate role in male development, but in adulthood it has a complicated relationship with hair. In people who carry genetic sensitivity to it, DHT binds to receptors in scalp follicles and gradually shrinks them: a process dermatologists call miniaturization. Over years, thick terminal hairs give way to fine, wispy ones, and eventually some follicles stop producing visible hair at all. That is androgenetic alopecia, better known as male- or female-pattern hair loss.

So the logic of the fear is easy to follow: DHT drives pattern baldness, the 2009 study showed creatine raising DHT, therefore creatine must accelerate baldness. Tidy. But biology rarely rewards tidy syllogisms.

Two links in that chain are weaker than they look. First, pattern hair loss depends less on how much DHT is circulating in your blood than on how sensitive your follicles are to it, sensitivity written by genetics, not by a supplement scoop. Men with aggressive balding and men with full heads of hair often have similar circulating DHT. Second, the prescription treatments that slow pattern loss work by suppressing DHT dramatically and continuously for years; a modest, within-range fluctuation over three weeks is a very different phenomenon from that kind of sustained hormonal pressure.

In other words: even if the 2009 result were rock solid, the leap from “DHT ticked up within normal limits” to “your hairline is in danger” was always a leap. The next question is whether the result was solid at all.

The problems researchers see with that single study

When scientists revisit the 2009 paper today, they raise a consistent set of concerns, not accusations of error, but reasons a single small result should be held loosely.

The sample was tiny. Twenty participants is enough to generate a hypothesis, not to settle a question. Small samples are famously prone to producing striking results that vanish when someone tries to reproduce them.

Baseline values were uneven. The participants’ starting DHT levels differed between study conditions, which makes percentage changes harder to interpret. When your starting line moves, your finish line tells you less.

Everything stayed in the normal range. A statistically significant change is not the same as a clinically meaningful one. No participant’s DHT left the healthy reference band.

Hair was never assessed. The study’s outcome was a blood value, yet it is cited daily as evidence about scalps. That is a category error the authors themselves never made: they reported a hormone finding and appropriately called for more research.

It has never been replicated. This is the decisive point. In science, a surprising result earns credibility when independent teams reproduce it. In the sixteen years since, no study has confirmed a meaningful creatine-driven rise in DHT, despite multiple groups looking. A 2021 review of the evidence, examining the available randomized trials on creatine and hormones, found no consistent effect on testosterone, free testosterone, or DHT.

One unreplicated, within-normal-range hormone blip in 20 men. That is the entire foundation of the myth. Everything built on top of it is architecture without a footing.

Has the DHT finding ever been replicated?

No, and it hasn’t been for lack of trying. Creatine is among the most-studied supplements in existence, with hundreds of trials spanning athletes, older adults, and clinical populations. Its hormonal effects have been examined repeatedly, and the pattern across that literature is monotony: testosterone and related androgens generally do not change in any consistent, meaningful way.

The table below summarizes how the evidence stacks up.

Evidence	Scope	Hormone finding	Hair measured?
2009 rugby study (van der Merwe et al.)	20 young men, 3 weeks	DHT rose 40–56% but stayed within the normal range; testosterone unchanged	No
2021 evidence review (Antonio et al.)	Roughly a dozen randomized trials on creatine and androgens	No consistent effect on testosterone or related hormones; the 2009 DHT result stands alone	No
2025 randomized controlled trial	Resistance-trained men, 12 weeks, placebo-controlled	No meaningful hormone differences between creatine and placebo	Yesno differences in hair growth or density

The 2025 trial is the one this debate had been waiting for, because it finally measured the thing everyone was arguing about. Over 12 weeks, four times the length of the original study, men taking creatine showed no meaningful differences from the placebo group in either androgen levels or direct assessments of their hair.

One study says a hormone moved. A dozen say hormones didn’t. The only trial that actually examined scalps found nothing. That is about as close to a resolved question as supplement science gets.

So, does creatine cause hair loss? Here's the honest answer

Based on the total body of evidence: no credible research shows that creatine causes hair loss, accelerates balding, or meaningfully raises the hormones that drive it.

A careful writer has to add the scientific asterisk, so here it is. No one can prove a perfect negative. There has never been a decade-long trial following thousands of genetically balding-prone men on creatine, and there probably never will be, studies like that are enormously expensive to run for a question this settled-looking. What we can say is what the evidence actually shows: the hormonal signal from 2009 has failed to reappear in any subsequent trial, and the one study that measured hair directly found no effect.

Compare that to how real hair-loss culprits behave in the literature. Genetic pattern loss shows up consistently across populations and decades. Severe stress, crash dieting, thyroid disease, and iron deficiency produce measurable, reproducible shedding that dermatologists document routinely. Creatine, examined again and again, produces nothing of the kind.

Here is the framing worth carrying out of this article: the question isn’t whether we can be infinitely certain creatine is innocent. The question is whether the evidence against it ever amounted to anything more than one small, unreplicated hormone reading. It didn’t. Treating that reading as proof of hair loss is like convicting someone because a witness thought they saw a similar coat.

Is creatine good for your hair?

Let’s answer the flip side, because plenty of people search for it: there is no evidence creatine benefits hair, either. It is neither villain nor tonic. Creatine’s job in the body is refreshingly specific: it helps regenerate ATP, the rapid-fire energy currency your muscles burn during short, intense efforts like sprints and heavy lifts. Your body makes creatine on its own and gets more from meat and fish; supplementation simply tops up muscle stores. None of that machinery has anything to do with follicles.

Hair does have real nutritional dependencies, and they’re worth knowing because deficiencies are among the fixable causes of shedding:

• Protein. Hair is built almost entirely of keratin, a protein. Prolonged low protein intake, common during aggressive dieting, can push follicles into their resting phase and trigger diffuse shedding.
• Iron. Low iron stores are a well-documented contributor to hair thinning, particularly in women.
• Overall energy. Severe calorie restriction is a classic trigger for temporary shedding, typically showing up two to three months after the diet begins.

Notice the irony. A lifter who starts creatine often starts a hard training block and a strict cut at the same time, and it’s the crash diet, not the white powder, that has an actual track record of causing hair to fall. The supplement gets blamed for the diet’s crime because it came in the same shopping bag.

If you want to eat for your hair, prioritize adequate protein, iron-rich foods, and enough total calories. No scoop of anything replaces that.

Should I take creatine if I'm balding or it runs in my family?

This is the question behind the question, and it deserves a nuanced answer rather than a cheer or a warning.

Start with the hard truth about genetics: if male-pattern baldness runs strongly in your family, your follicles’ sensitivity to DHT was decided long before you ever walked into a supplement aisle. Roughly half of men experience noticeable pattern loss by age 50, and many see the first signs in their twenties. That trajectory is driven by inherited biology. Nothing in the creatine literature suggests the supplement changes it in either direction.

So the evidence-based position is that balding-prone men have no demonstrated reason to avoid creatine. The 2025 trial that measured hair directly found no difference from placebo, and the hormonal case collapsed under replication attempts.

That said, evidence and anxiety live in different parts of the brain. If you are genuinely worried, if you’d spend every week of supplementation studying your part line, it is entirely reasonable to skip it. Creatine is a performance aid, not a health necessity, and no supplement is worth months of low-grade dread. It is also completely reversible: stopping simply lets your muscle stores drift back to baseline over a few weeks.

The genuinely smart move for someone watching a changing hairline is different anyway: see a dermatologist early. Pattern hair loss is progressive, the interventions that exist work best when started sooner rather than later, and a professional can tell you whether what you’re seeing is genetic patterning, temporary shedding, or nothing at all. That conversation will do more for your hair than any decision about a supplement ever could.

What are the real risks of taking creatine?

Creatine has a genuine side-effect profile: it’s just far less dramatic than the folklore. Here is what the evidence actually supports.

Water weight. Creatine pulls water into muscle cells, so most people gain a pound or two on the scale within the first weeks. This is intracellular water, not fat, and it reverses if you stop. For athletes in weight-class sports it’s worth planning around; for everyone else it’s a footnote.

Stomach upset. Large single servings can cause bloating, cramping, or loose stools in some people. Spreading intake out and taking it with food usually resolves this.

A misleading lab value. This one trips up doctors and patients alike. Creatine breaks down into creatinine, the very marker used to estimate kidney function on routine blood panels. Supplement users can show mildly elevated creatinine with perfectly healthy kidneys: the number rises because more raw material is passing through, not because filtration has declined. Always tell your clinician you take creatine before bloodwork, or you may end up chasing a phantom problem.

Kidney safety in healthy people. Despite decades of worry, studies in healthy adults, including trials running as long as five years, have not shown kidney damage from standard use. Mayo Clinic characterizes creatine as likely safe for most healthy people when used appropriately over that time frame. People with existing kidney disease are a different story entirely and should not take it without medical guidance.

What you will not find on any evidence-based risk list: hair loss. It has never earned a place there.

Why do some doctors say no to creatine?

If your physician has waved you off creatine, they probably weren’t thinking about your hairline. The legitimate reasons for caution are more practical, and they’re worth understanding rather than dismissing.

Kidney or liver disease. Anyone with impaired kidney function, or conditions like diabetes and high blood pressure that threaten it, needs individualized advice before adding a substance the kidneys help clear. This is the single most common medical reason to decline.

Supplements aren’t pre-approved. In the United States, dietary supplements don’t undergo pre-market approval the way prescription products do. Quality varies between manufacturers, and contamination or inaccurate labeling does happen. Physicians who’ve seen mystery ingredients cause real problems tend to be conservative about the whole category. Looking for products verified by independent third-party testing programs addresses much of this concern.

Age. Most safety research involves adults. Many clinicians prefer that teenagers focus on training, sleep, and food before adding supplements, simply because the adolescent evidence base is thinner.

The lab-work headache. As covered above, creatine elevates creatinine and can muddy kidney-function tests. Some doctors would rather keep that variable out of your chart.

It’s optional. Physicians are trained to weigh necessity. Creatine offers modest, well-documented performance benefits for high-intensity exercise, but nobody needs it, and “you’d be fine without it” sometimes gets compressed into “no.”

Notice what’s absent from every one of these: hair. When doctors hesitate about creatine, they’re thinking about kidneys, quality control, and age, not follicles. If hair is your specific worry, raise it directly; you’ll likely hear a version of what this article says.

Why the myth refuses to die

If the evidence is this lopsided, why does the rumor outlive every debunking? A few forces keep it on life support.

The timing is a perfect trap. Men most commonly start creatine between 18 and 30, precisely the decade when androgenetic alopecia often announces itself. When two things begin in the same season of life, the human brain welds them together. The man who starts supplementing at 23 and notices temple recession at 24 has almost certainly witnessed his genes at work, but the tub on his counter makes a much more satisfying suspect.

Confirmation bias does the rest. Once someone hears “creatine causes hair loss,” every hair on the shower drain becomes evidence. Healthy people normally shed on the order of 50 to 100 hairs a day; start counting anxiously and that ordinary number looks like a crisis.

Anecdotes outrun data online. A dramatic before-and-after post travels further than a 2021 systematic review ever will. Forum threads quote each other in circles until a single 2009 blood test acquires the cultural weight of a landmark trial.

A grain of truth is stickier than a pure lie. The myth survives partly because it isn’t fabricated from nothing: a real study really did report a DHT change. Myths with a citation attached are the hardest kind to kill, because the correction requires nuance: yes, that study exists; no, it doesn’t show what you think. Nuance loses to a one-line comment every time.

The antidote is the same as ever, asking what was actually measured, in how many people, and whether anyone ever found it again.

What actually causes hair loss?

Since we’ve spent an article acquitting a suspect, it’s only fair to name the actual offenders. If your hair is thinning, one of these is overwhelmingly more likely than anything in your gym bag.

Genetics. Androgenetic alopecia is far and away the most common cause: the receding temples and thinning crown in men, the widening part in women. It reflects inherited follicle sensitivity to DHT, tends to progress gradually, and touches roughly half of men by 50 and a substantial share of women, particularly after menopause.

Telogen effluvium. This is the temporary, diffuse shedding that follows a shock to the system: serious illness or high fever, surgery, significant psychological stress, childbirth, or rapid weight loss. The shedding typically starts two to three months after the trigger and usually resolves on its own once the body recovers, but because of that delay, people rarely connect the shed to its true cause, and innocent bystanders like supplements take the blame.

Medical and nutritional causes. Thyroid disorders, iron deficiency, and inadequate protein intake all have documented links to hair thinning, and all are identifiable with straightforward testing.

Mechanical and inflammatory causes. Chronically tight hairstyles can produce traction alopecia; autoimmune conditions like alopecia areata cause distinct round patches; scalp conditions can disrupt growth as well.

One pattern worth flagging for fitness readers specifically: an aggressive cut, big calorie deficit, sudden weight drop, high training stress, is a textbook telogen effluvium trigger. If your shedding began a couple of months into a hard diet phase, the arithmetic points at the deficit, not the creatine you started alongside it. The good news is that diet-driven shedding generally reverses once eating normalizes.

When should you see a doctor about hair loss?

Most hair loss isn’t a medical emergency, but some patterns deserve professional eyes, and even garden-variety pattern loss benefits from an early conversation, because the earlier it’s addressed, the more options remain on the table.

Make an appointment with your doctor or a dermatologist if you notice any of the following:

• Sudden or patchy losshair coming out in clumps, or smooth round bald patches appearing over weeks. These can signal alopecia areata or another condition that warrants evaluation.
• Shedding with other symptomsfatigue, unexplained weight change, feeling unusually cold or hot, or menstrual changes can point toward thyroid trouble, iron deficiency, or another treatable cause worth testing for.
• Scalp changesredness, scaling, pain, itching, or burning alongside the loss suggests an inflammatory or infectious process rather than simple patterning.
• Loss after starting a new medicationsome prescriptions list hair changes among their effects; never stop a medication on your own, but do raise it with your prescriber.
• A steady march of pattern loss that bothers you. Effective, evidence-based interventions exist for androgenetic alopecia, and dermatologists consistently note they preserve existing hair better than they resurrect lost follicles. Sooner beats later.
• Distress. The NHS explicitly recognizes that hair loss can affect emotional wellbeing. If it’s weighing on you, that alone is a legitimate reason to seek help, both medical and, if needed, psychological.

What a doctor can do that the internet can’t: examine your scalp, order the blood tests that catch thyroid and iron issues, and tell you which kind of hair loss you actually have. Everything sensible flows from that diagnosis.

The bottom line: one small study is not a verdict

Strip this story to its skeleton and it becomes a useful lesson in reading health claims, one that applies far beyond creatine.

A single three-week study of 20 athletes reported a hormone fluctuation that never left the normal range. It measured no hair. No one has reproduced it in sixteen years. A review of the surrounding trials found no consistent hormonal effect at all, and the first randomized trial to actually examine scalps, for 12 weeks, against placebo, found nothing. In evidence terms, the case didn’t just weaken over time; it was dismantled piece by piece.

Meanwhile, the things that genuinely move the needle on hair get far less attention than the myth does: family history, thyroid and iron status, adequate protein and calories, managing severe stress, and seeing a dermatologist early when pattern loss begins. That’s where a worried person’s energy belongs.

So the next time a locker-room expert delivers the verdictit’s the creatineyou’ll know the whole chain of custody: one study, twenty rugby players, three weeks, zero hairs counted. Some myths survive because they’re comforting. This one survives because it comes with a citation. Now you’ve read the citation, and the rest of the file besides.

Frequently asked questions

Does creatine cause hair loss?

No credible evidence shows that creatine causes hair loss. The worry comes from a single 2009 study of 20 rugby players in which DHT rose but stayed within the normal range, and hair was never measured. Roughly a dozen later studies found no consistent hormonal effect, and a 2025 randomized trial that assessed hair directly over 12 weeks found no difference between creatine and placebo.

Is creatine good for your hair?

No, creatine neither harms nor helps hair, as far as research shows. Its role is regenerating ATP, the quick energy your muscles use during intense exercise; it has no known function in follicles. Hair health depends on things like adequate protein, iron, overall calories, thyroid function, and genetics. If you want to support your hair nutritionally, focus on a balanced diet rather than any single supplement.

Should I take creatine if I'm balding?

The evidence gives balding-prone men no demonstrated reason to avoid creatine, genetics, not supplements, drives pattern hair loss, and the trial that measured hair directly found no effect. That said, creatine is optional, so skipping it is perfectly reasonable if it would cause you ongoing worry. The more valuable step for a changing hairline is seeing a dermatologist early, since interventions for pattern loss work best when started sooner.

Does creatine increase DHT?

One 2009 study of 20 rugby players reported a DHT increase of 40–56 percent that remained within the normal laboratory range. No subsequent study has replicated that finding. A 2021 review of the available randomized trials found no consistent effect of creatine on DHT, testosterone, or related hormones, and a 2025 trial likewise found no hormone differences versus placebo. On balance, the evidence does not support a meaningful DHT effect.

What are the risks of taking creatine?

For healthy adults using it appropriately, documented side effects are modest: a pound or two of water weight as muscles hold more fluid, occasional stomach upset with large servings, and a harmless rise in blood creatinine that can mimic a kidney problem on lab tests. Studies up to five years long in healthy people have not shown kidney damage. People with kidney disease should not take creatine without talking to their doctor first.

Why do doctors say no to creatine?

Usually for reasons unrelated to hair: pre-existing kidney or liver conditions, the fact that supplements aren’t pre-approved for quality the way prescription products are, limited safety data in teenagers, and the way creatine muddies kidney-function blood tests. Some doctors also simply note that no one needs it. If your physician advises against creatine, ask about their specific reasoning: the answer is almost never about your hairline.

If I stop taking creatine, will my hair grow back?

There’s no evidence creatine caused the loss, so stopping it isn’t a hair treatment. What matters is identifying the real cause. Temporary shedding from stress, illness, or crash dieting typically regrows on its own within months once the trigger resolves. Genetic pattern loss, by contrast, progresses regardless of supplements and responds best to early evaluation by a dermatologist, who can recommend evidence-based options.

Does creatine affect testosterone?

No. This is one of the most consistent findings in creatine research: across the randomized trials reviewed in 2021, creatine did not meaningfully raise or lower testosterone or free testosterone. Even the 2009 study that sparked the hair loss myth found no testosterone change, only a shift in DHT that later studies failed to reproduce. Creatine’s performance benefits come from cellular energy supply, not hormones.

Does creatine cause hair loss in women?

There is no evidence that it does. The original 2009 study involved only men, and even its unreplicated DHT finding hasn’t been shown in women. Female hair thinning most often traces to genetics, iron deficiency, thyroid conditions, hormonal shifts such as postpartum changes or menopause, or restrictive dieting. A woman noticing increased shedding is far better served by blood tests and a dermatology visit than by dropping a supplement.

How do I know if my hair loss is genetic or something else?

Pattern gives the biggest clue: genetic loss in men usually shows as receding temples and a thinning crown, and in women as a gradually widening part, both progressing slowly. Sudden diffuse shedding a few months after illness, major stress, childbirth, or a crash diet suggests temporary telogen effluvium, while round patches or scalp redness point to other conditions. A doctor can confirm the type with an exam and simple blood tests for thyroid and iron.

References

• Creatine: MedlinePlus
• Hair loss: NHS

This article is for general information only and is not a substitute for professional medical advice. Please consult a qualified doctor about your individual situation.