Does infrared sauna promote hair growth? If you’ve searched for the answer, you’ve probably seen pages promising thicker hair, “detoxed” follicles, and a healthier scalp. It sounds great. The problem is that most of those claims never point to a single study on hair.
So here’s the straight answer, backed by what the research actually shows. A sauna can support a few things hair likes, such as relaxation and blood flow. But it isn’t a proven hair loss treatment, and the heat can dry out your strands.
Below, you’ll see what’s real, what’s hype, and how to protect your hair if you love your sauna sessions.
Quick answer: Not directly. We couldn’t find a controlled human trial showing that infrared sauna sessions regrow hair. A sauna may help indirectly by easing stress and boosting circulation, but that’s unproven for hair. The best light-based evidence belongs to red light therapy aimed at the scalp, which is a different thing.
Key Takeaways
- No study we found tests infrared sauna sessions as a treatment for hair loss.
- Better circulation and relaxation are real sauna perks, but their link to hair is indirect.
- Red light therapy has the strongest light-based evidence for pattern hair loss.
- Heat can dry and weaken hair strands, so protection matters.
- Sudden or patchy hair loss needs a doctor, not a sauna.
What Is an Infrared Sauna?
An infrared sauna warms your body directly with infrared light panels instead of heating the air around you the way a traditional sauna does.
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Because of that, the cabin often runs cooler, commonly around 120 to 150°F (about 50 to 65°C), yet you still sweat a lot. Most panels give off far infrared, which you feel as gentle heat.
That detail matters for hair, because the light used in hair studies is a different kind. We’ll get to that shortly.
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How Hair Grows (and Why It Thins)
Every hair follicle works in cycles. There’s a growth phase (anagen) that lasts years, a short transition phase (catagen), and a resting phase (telogen) before the hair sheds.
Scalp hair grows roughly 1 cm, or about half an inch, a month. That’s slow, which is why any treatment needs months before you can judge it.
The reasons hair thins are more varied than most sauna pages admit:
- Pattern hair loss (androgenetic alopecia): driven by genetics and hormones. It’s the most common cause.
- Telogen effluvium: temporary shedding after stress, illness, rapid weight loss, or low iron.
- Alopecia areata: patchy loss tied to the immune system.
- Scarring alopecias: permanent follicle damage that needs early medical care.
This matters because a sauna can’t change your genes, your hormones, or your immune system. The only cause it could plausibly touch is stress-related shedding, and even that effect is indirect.
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Does Infrared Sauna Promote Hair Growth? What the Evidence Says
Short answer: there’s no strong evidence that it does. Reviews of sauna bathing point to benefits for circulation and general wellbeing, but none of the sources we reviewed measured hair regrowth as an outcome.
The usual pitch goes like this: more blood flow means more nutrients, less cortisol means less shedding, and sweating clears out toxins. The first two are reasonable ideas. The third has no hair research behind it. Here’s how each claim holds up.
| Claim | What we found | Verdict |
|---|---|---|
| Sauna boosts blood flow, including to the scalp | Heat raises circulation in general. Hair-specific proof is missing. | Plausible, unproven for hair |
| Less stress means less shedding | Stress can trigger shedding, and a sauna may help you relax. No trial links sauna use to less shedding. | Indirect, unproven |
| Sweating out toxins feeds follicles | No hair study supports it. | Unsupported |
| Infrared boosts collagen and keratin in the scalp | Appears on sauna sites, with no hair data for sauna sessions. | Unsupported |
| Sauna regrows hair in pattern baldness | No controlled trial found. | Not shown |
So why do so many pages say it works anyway? Because plausible biology is easy to write about, and a plausible idea isn’t the same as a tested one. Hair-care brands tend to be more careful.
Nutrafol, for example, describes sauna use as a supportive habit rather than a direct hair growth treatment. That’s the right way to think about it.
Infrared Sauna vs Red Light Therapy for Hair
This is the part most guides skip, and it’s the most useful thing to understand.
Red light therapy, also called low-level light therapy (LLLT) or photobiomodulation, uses specific red wavelengths, generally around 650 nm in consumer hair devices, aimed straight at the scalp. That’s not the same as the far infrared heat in most saunas.
And the research on LLLT is genuinely encouraging:
- A systematic review and meta-analysis in Dermatologic Surgery (Perez et al.) pooled 38 studies and 3,098 patients, mostly with pattern hair loss. Hair density rose with LLLT compared with placebo over 4 to 26 weeks.
- An earlier meta-analysis of seven double-blind randomized trials of home-use light devices found a significant increase in hair density versus sham devices.
- A 2024 study of people with shedding after long COVID reported improvements with red LED therapy.
There are limits. Results varied quite a bit between trials, devices differ, and the evidence for shedding types other than pattern loss is thinner.
| Infrared sauna | Red light device (scalp) | |
|---|---|---|
| Main effect | Whole-body heat and relaxation | Light delivered to the scalp |
| Hair-specific trials | None found | Several trials and meta-analyses |
| Heat risk to hair | Yes | Low |
| Best for | General wellness | Pattern hair loss, as an add-on |
A quick buying tip: some saunas include red LED panels. Those aren’t automatically the same as a scalp device. Ask for the wavelength, the power at the distance you’ll sit, and whether the maker can point to hair studies. If it can’t, treat the red light as a bonus, not a hair treatment.
Possible Benefits for Your Hair and Scalp
These are realistic, indirect perks. None of them is a promise of regrowth.
Stress Relief and Better Sleep
Chronic stress and poor sleep are both linked to shedding. A sauna session can be a calming ritual, and some people find that infrared sauna helps with anxiety and stress. If it helps you wind down, it may support the conditions your hair needs. This applies most to stress-related shedding, which often settles once the trigger passes.
Circulation
Heat widens blood vessels and increases blood flow. Follicles need oxygen and nutrients, so healthy circulation supports normal growth. But nobody has shown that the extra blood flow from a sauna reverses hair loss.
A Healthier Routine
People who use saunas regularly often pay more attention to sleep, hydration, and stress too. Those habits help hair, even if the sauna isn’t the hero.
Risks and Side Effects
Let’s be honest about the downsides, because they’re the part most pages skip.
- Dry, brittle hair. Heat can lift the cuticle, the hair’s outer layer. Lab work on heat-damaged hair shows how this leads to roughness and breakage. Curly, colored, or chemically treated hair is more vulnerable.
- Dehydration. Heavy sweating without enough water leaves you, and your hair, drier.
- Scalp irritation. Sweat and product buildup can bother a sensitive scalp.
- Delaying real treatment. This is the biggest risk. Months spent on an unproven method is time that pattern hair loss keeps progressing.
- General sauna cautions. Pregnancy, heart or blood pressure conditions, heat sensitivity, and some medications call for a doctor’s advice first.
People often ask whether infrared sauna causes hair loss. It isn’t known to cause it on its own. What it can do is dry and weaken the strands, and that can make hair look thinner than it is.
How to Protect Your Hair in an Infrared Sauna
If you’re going to use a sauna anyway, a few small habits make a real difference. These steps are the simplest way to protect your hair in an infrared sauna:
- Hydrate first. Drink water before you go in and sip during the session.
- Add a light leave-in conditioner or a little hair oil to the lengths, not the scalp, to cut moisture loss.
- Cover up. A felt or wool sauna hat works well, or wrap your hair in a cotton towel.
- Keep hair loosely tied and away from hot benches and panels. Skip metal clips, since they heat up.
- Keep sessions modest, especially if your hair is dry, bleached, or curly.
- Rinse the sweat out afterward, then cleanse gently and moisturize.
- Ask your doctor about timing if you use a topical hair loss medicine such as minoxidil.
How Often and How Long?
There’s no established dose for hair. Most sessions run 15 to 30 minutes, and regular users go a few times a week. If you’re new, figure out how long to stay in an infrared sauna by starting short and building up. More isn’t better for hair, since extra heat just means extra dryness.
What Actually Works for Hair Loss
| Option | Best for | Evidence level |
|---|---|---|
| Topical minoxidil | Pattern hair loss in men and women | Established, FDA-approved |
| Oral finasteride | Male pattern hair loss (prescription) | Established, FDA-approved |
| Red light therapy devices | Mild to moderate pattern hair loss | Promising, varied results |
| Treating the cause (iron, thyroid, diet, stress) | Temporary shedding | Strong when a cause is found |
| Infrared sauna | General wellness and relaxation | No hair-specific trials found |
A dermatologist can tell you which type of loss you have and which option fits it best.
Myth vs Fact
| Myth | Fact |
|---|---|
| Sweating out toxins grows hair. | No hair study supports this. |
| Infrared sauna regrows hair. | No trial shows it. Red light devices have the evidence. |
| Saunas cause baldness. | Not known to. They can dry and weaken strands. |
| Hotter and longer is better. | More heat means more damage and dehydration. |
| Any red light feature is a hair treatment. | Wavelength, dose, and distance matter. |
Common Mistakes
- Swapping proven treatment for a sauna.
- Sitting in the heat with dry, unprotected hair.
- Skipping water.
- Expecting results in a few weeks. Hair needs months.
- Buying a sauna mainly for hair.
When to See a Doctor
Book an appointment if you notice sudden or heavy shedding, bald patches, scalp pain, redness, scaling, or hair loss alongside fatigue or other symptoms. Early care protects follicles in conditions like scarring alopecia and can uncover fixable causes such as low iron or thyroid problems.
Here’s a quick way to decide. If your loss is sudden or patchy, see a doctor first. If it’s gradual thinning at the part, crown, or hairline, ask a dermatologist about minoxidil, finasteride, or light therapy. If your hair is healthy and you simply enjoy saunas, go ahead, with the protection steps above.
FAQs
Does infrared sauna help hair grow?
Not directly. It may support relaxation and circulation, but we found no study showing sauna sessions regrow hair.
Is infrared sauna bad for your hair?
Not if you protect it. Hydrate, use a leave-in product, and cover your hair.
Is infrared better than a traditional sauna for hair?
There’s no good evidence either way. Both heat the hair. Infrared cabins often run cooler, which may be gentler, but that isn’t proven.
Does red light therapy work better than a sauna for hair?
For pattern hair loss, yes. Red light therapy has randomized trials behind it. Saunas don’t.
How long until I see results?
Hair grows slowly. Light therapy trials ran 4 to 26 weeks. For saunas, there’s no benchmark.
Should I wear a hat in an infrared sauna?
A felt or wool sauna hat helps shield your hair from heat. A towel wrap also works.
Can I use a sauna with minoxidil or finasteride?
Often yes, but ask your doctor, especially about the timing of topical products.
Does sweating clean the scalp?
Not really. Sweating doesn’t replace washing, so rinse it off afterward.
Can it help with stress-related shedding?
It may help you relax, and this kind of shedding often settles as stress eases. Treat the sauna as support, not a cure.
Who should avoid infrared sauna?
People who are pregnant, have heart or blood pressure conditions, or are sensitive to heat should talk to a doctor first.
Final Thoughts
So, does infrared sauna promote hair growth? Not in any way that’s been proven. It’s a lovely way to unwind, and unwinding may help your hair in small, indirect ways. But the heat can also dry out your strands if you’re not careful.
If you want real movement on thinning hair, start with a proper diagnosis. Proven treatments and red light therapy have the evidence. Keep the sauna as a wellness habit, protect your hair, and give any change time, because hair takes months to show it.
This article is for general information and isn’t medical advice. Talk to a doctor or dermatologist about hair loss.