Exercise and hair health: what is and is not linked

Exercise is one of the best things you can do for your overall health. The NHS recommends that adults aged 19 to 64 do at least 150 minutes of moderate activity or 75 minutes of vigorous activity a week, plus strengthening activities on at least 2 days a week ¹. So why do so many people at the gym worry about their hair?

Most of the worry comes from three places: sweat, supplements and hormones. Some of these links are real, some are weak, and some are mostly myth. This guide sorts them out.

What is not linked: exercise itself

There is no good evidence that regular exercise on its own causes hair loss. Pattern hair loss is mainly driven by genes and hormones, and it tends to progress whether or not you train. If you notice thinning while you happen to be going to the gym more, the timing can be a coincidence. Pattern loss can begin in early adulthood, around the age many people get serious about training.

Sweat and the scalp

Sweat does not damage hair follicles. What can cause trouble is sweat, oil and product build-up left on the scalp, which may make dandruff or itch worse in some people. In Malaysia's heat this is common. Simple steps help:

• Wash your hair after heavy sweating if your scalp gets itchy or greasy.
• Use a gentle shampoo so frequent washing does not dry the scalp. See our gentle hair care routine.
• Let helmets, caps and headscarves dry fully between uses.

Our guide to sweat, the gym and hair covers this in more detail.

Tight styles and friction

Pulling hair into a very tight ponytail or bun for every workout, day after day, can stress the hairline over time. Rotating styles, using soft hair ties and loosening the hold helps. The same applies to tight caps or sports headbands worn for long hours.

Creatine: what the studies say

Creatine is one of the most popular gym supplements, and the hair worry comes from one small study. In 2009, researchers gave college rugby players creatine or a placebo. After 7 days of loading, DHT levels rose by 56% and stayed 40% above baseline after 14 more days at a lower dose. The DHT-to-testosterone ratio also rose ². Because DHT is linked to pattern hair loss, this was widely read as "creatine causes balding". But the study measured hormones only, not hair, and involved 20 players.

In 2025, a 12-week randomised trial looked directly at hair. Forty-five resistance-trained men aged 18 to 40 took 5 g of creatine a day or a placebo, and 38 completed the study. The researchers found no differences in DHT, the DHT-to-testosterone ratio or hair measures such as density and thickness between the groups ³.

A 2021 review of common creatine questions, which included the hair question, describes creatine as relatively well tolerated at recommended doses of 3 to 5 g a day ⁴.

Two honest caveats. Several authors of both the trial and the review report ties to companies that make or sell creatine or sports supplements ^{3 4}. And a 12-week trial in young men cannot answer every long-term question. A fair summary is that current evidence does not show creatine causing hair loss, but the research is still limited. See our full guide to creatine and hair loss.

Anabolic steroids: a real link

This is where the link is clear. Anabolic steroids copy the effects of male hormones such as testosterone. The NHS lists hair loss among their effects in both men and women, alongside acne, fertility problems and serious risks to the heart, liver and mental health ⁵. If you are worried about your hair, avoiding steroids not prescribed by a doctor is one of the clearest steps you can take.

Crash diets and rapid weight loss

Losing a lot of weight fast, or training hard while eating too little, can trigger shedding. A medical overview of telogen effluvium lists crash dieting, low protein intake and iron deficiency among common triggers ⁶. This kind of shedding usually shows up some weeks after the trigger. Eating enough, especially enough protein, matters when you train. See our guides on protein and hair and iron and hair loss.

Stress, sleep and recovery

Exercise can help with stress. The NHS notes that it will not make stress disappear, but can reduce some of its emotional intensity ⁷. Significant physical stress, such as severe illness or major surgery, is a recognised trigger of shedding ⁶, so a balanced routine with enough rest is better than punishing yourself. Good sleep and not smoking support overall health too.

A practical checklist

• Keep training. The overall health benefits are clear ¹.
• Wash off heavy sweat and build-up, gently.
• Avoid very tight styles and headgear for long hours.
• Eat enough, especially protein, and avoid crash diets.
• Do not use anabolic steroids unless a doctor prescribes them.
• If you use creatine and worry about your hair, track it with photos and talk to a doctor.
• If you notice sudden shedding, patches or scalp symptoms, see a doctor. Our first steps guide explains what to do.

Frequently asked questions

Does going to the gym cause hair loss?

There is no good evidence that exercise itself causes hair loss. The NHS recommends regular activity for overall health ¹.

Does creatine make you go bald?

A 2025 randomised trial found no differences in DHT or hair measures after 12 weeks, though some authors report industry ties and long-term data are limited ³.

Can anabolic steroids cause hair loss?

Yes. The NHS lists hair loss among the effects of anabolic steroids in both men and women ⁵.

Can losing weight quickly cause shedding?

It can. Crash dieting and low protein intake are listed among common triggers of telogen effluvium ⁶.

Educational content. Not medical advice.