Does the sauna dry out your hair?

Does the sauna dry out your hair?

Saunas can dry out hair by stripping away natural oils and moisture, particularly in high-heat traditional models with low humidity. Infrared saunas are a gentler alternative, and some people find the added warmth and blood flow at the scalp leaves hair feeling better — though the research on sauna use and hair is limited. To reduce dryness, many people keep sessions short and protect their hair with a leave-in conditioner or a dedicated hair wrap.

Key Takeaways

• Saunas can dry out hair by stripping natural oils, especially during long or frequent sessions
• Traditional saunas tend to be more drying than infrared saunas due to higher heat and lower humidity
• Infrared sauna sessions may support scalp comfort through increased blood flow, though the evidence on hair growth specifically is limited
• Using hair masks or deep conditioning treatments before sessions may help lock in moisture
• A 2025 review describes typical sessions in traditional Finnish-style sauna bathing as 5 to 20 minutes; keeping sessions in that range, covering hair, and staying hydrated may reduce the risk of dryness
• Infrared saunas run at lower temperatures, while traditional saunas deliver hotter, more classic heat — either can be used comfortably with the right hair care
• Pairing regular sauna use with a good hair-care routine is the practical way to keep hair feeling healthy

Saunas have been celebrated for centuries for their therapeutic traditions, including relaxation, warmth, and recovery. Yet many sauna enthusiasts wonder about the impact on their hair. Understanding how different types of saunas affect your hair can help you enjoy your sessions while protecting your locks. Whether you're concerned about dryness, curious about hair growth, or worried about potential damage, this guide walks through what is known, what isn't, and what to do about it.

Does Sauna Actually Dry Out Your Hair?

The short answer is yes: saunas can dry out your hair, but the extent depends on the type of sauna you use. Traditional saunas generate heat by heating rocks, which in turn heat the air.

This hot air can cause dryness not only to your skin but also to your hair. The high temperatures and low humidity of traditional saunas can strip your hair of its natural oils, leaving it dry, brittle, and prone to breakage.

This is especially true if you spend considerable time in the sauna or if you have naturally dry or damaged hair. Intense heat can also lift the hair cuticle — the protective outer layer of each strand — which makes hair more vulnerable to moisture loss.

How much strength a sauna session actually costs a hair fibre has not been measured. Heat damage to hair is well established for hot styling tools, which press the fibre directly at roughly 300–450°F (150–230°C); sitting in warm air is a different exposure, nobody has bridged the two, and so we do not put a percentage on it.

Pro Tip: If you have dry, color-treated, or fragile hair, apply a leave-in conditioner or hair mask before entering the sauna. A protective layer helps reduce moisture loss and keeps strands softer during high heat.

How Do Infrared Saunas Differ for Hair Health?

One note on the temperature column: an infrared cabin is not locked to a low temperature. Sun Home's Eclipse and Equinox are adjustable to 165°F and the Luminar to 170°F, so the "gentler heat" advantage comes from how you set the cabin and how long you sit, not from a ceiling the sauna cannot pass. As with any sauna, actually reaching a maximum temperature depends on ambient air temperature, humidity, proper installation and maintenance.

Infrared saunas use infrared heaters to warm your body directly rather than heating the air. This produces gentler, more even heat at a given setting, which can make it easier for hair to hold on to moisture.

In fact, some people use infrared saunas as part of a hair-care routine. A lower operating temperature and focused heat delivery make infrared sessions less likely to leave hair feeling parched.

If you want a spa-like experience with control over heat and humidity, a luxury home sauna provides flexibility to fine-tune your sessions and protect your hair's moisture while you relax.

Electrical specs are per model, not per family. The figures above are for the Equinox 2-Person, the Eclipse 4-Person and the Luminar 5-Person. Other sizes in the same families are wired differently: the Eclipse 2-Person is 120V / 2,820W on a NEMA L5-30P plug into a dedicated NEMA L5-30R outlet, and the Luminar 2-Person is 240V / 4,800W on a NEMA L6-20P plug into a NEMA L6-20R outlet, on a dedicated 240V 20-amp GFCI circuit installed by a certified electrician. GFCI requirements differ by size. Luminar 2-Person: Dedicated circuit with GFCI protection (GFCI breaker or GFCI outlet); check local code. Luminar 5-Person: Dedicated circuit with a GFCI breaker; check local code. Meeting the model's GFCI requirement is a warranty condition on every Luminar. Always confirm the spec sheet for the exact model you are buying before an electrician runs a circuit.

Key Insight: Traditional saunas are more likely to dry out hair because of their hotter, drier environment. Infrared saunas can be run at gentler settings, which makes them an easier option if your goal is to minimize dryness.

Can Saunas Actually Promote Hair Growth?

Heat raises blood flow to the skin, and that includes the scalp. A 2023 review in the Journal of Clinical Medicine links follicular blood supply to the hair growth cycle, noting that increased blood flow is associated with the telogen-to-anagen transition — but how much a sauna changes scalp perfusion has not been measured, and no published figure for it exists. A sauna is not a hair-growth treatment and should not be bought as one.

Improved circulation also helps carry waste products away from the scalp, which is part of why a warm session can leave the scalp feeling refreshed.

Research specifically on sauna use and hair is limited. No high-quality trial has established that sauna use prevents hair loss or increases hair density, and any claim that it does should be treated with caution — including claims made by sauna sellers.

What Are the Main Hair Benefits of Sauna Use?

Used in moderation and with proper precautions, a sauna session can be a comfortable part of a hair health routine. Here is what people most often report:

• Improved Circulation: Heat increases blood flow, including at the scalp, which may help deliver nutrients and oxygen to hair follicles.
• Stress Relief: Stress is a recognized contributor to hair shedding. Saunas are widely used for relaxation, which may indirectly help.
• Buildup Removal: Sweating during a session can help clear excess oil and product buildup from the scalp.
• Improved Texture: Many regular users say their hair looks and feels shinier, softer, and more manageable when sessions are paired with conditioning.
• Moisture Retention: Traditional saunas can be drying; infrared sessions at lower settings, with hair protected, are less likely to leave hair dehydrated.

Any high-quality full-spectrum infrared sauna for sale offers multi-wavelength technology, providing both relaxation and gentle yet deep heat.

Does Regular Sauna Use Cause Hair Loss?

There is some concern that saunas can contribute to hair loss, particularly in men. The theory suggests that the high heat in traditional saunas can damage hair follicles, leading to hair loss over time.

However, there is little scientific evidence to support this theory. High heat and low humidity can make hair brittle and prone to breakage, but that is mainly a concern if you spend excessive time in the sauna or already have pre-existing hair loss or damage.

There's no strong evidence either way that normal sauna use causes hair loss. Some people argue the opposite — that better circulation and lower stress may be protective — but that has not been demonstrated in controlled research either.

How Can You Protect Your Hair During Sauna Sessions?

The effect of saunas on your hair depends on several factors, including sauna type, session duration, and your hair type and condition. Here are essential protection strategies:

Use a Hair Mask: Applying a hair mask or deep conditioning treatment before entering the sauna can help protect hair from heat, locking in moisture.

Keep Sessions Short: A 2025 review in Frontiers in Cardiovascular Medicine describes typical sessions in traditional Finnish-style sauna bathing as lasting between 5 and 20 minutes. That is a description of common practice, not a safety limit and not a dose — and it comes from traditional Finnish-style bathing rather than from an infrared cabin. Keep yours toward the shorter end while you are getting used to the heat, and check with your healthcare provider if you have a health condition, are pregnant or take medication.

Stay Hydrated: Drink plenty of water before and after your sauna session.

Protect Your Hair Physically: Wear a cap or wrap a towel over your hair while in the sauna. You can also tie your hair up in a loose bun or braid to minimize direct heat exposure.

Choose the Right Sauna Type: Consider using infrared saunas, which can be run at lower temperatures and provide gentler heat that's less likely to dry out hair.

For compact spaces and solo wellness routines, Personal Saunas are ideal, allowing regular, gentle sessions that are less likely to stress your hair.

With professional home sauna installation, you can customize settings and duration, which is especially useful if you have sensitive hair or scalp.

Should You Use Hair Masks in the Sauna?

Using a hair mask or deep conditioning treatment in the sauna can help protect your hair from heat and humidity. Simply apply the mask or treatment before entering the sauna and leave it on for the duration of your session.

The gentle heat may help the conditioning ingredients penetrate the hair shaft, while protecting your strands from potential dryness.

Be sure to use a hair mask specifically designed for heat application or check with your hairstylist before using any product in the sauna. Not all hair masks are created equal, and some may contain ingredients that can be damaging when heated.

"The key to sauna hair care is understanding the 'open-close' cycle. The heat of a sauna causes the hair cuticle to lift, which is an opportunity for deep conditioning but also a risk for dehydration. When you apply a rich hair mask or oil before your session, you are using the heat to help drive nutrients into the shaft. Sealing that moisture with a quick cold rinse afterward can leave the hair feeling smoother." — Sun Home Saunas Hair & Scalp Specialist.

What About Alternating Sauna with Cold Water?

Alternating between sauna and a cold plunge tub may help invigorate your hair and scalp. Some people find the contrast tightens the cuticle and helps seal in moisture.

However, always use caution with extreme temperature changes to avoid stress on sensitive hair or skin. Sudden shifts can add stress to hair that is already compromised.

Make your home routine even better by adding sauna accessories, such as moisture-guard hair wraps, heat-resistant combs, or hydration spray bottles, to care for your hair during every session.

Is Sauna-Induced Hair Growth a Myth or Reality?

Saunas are not a cure for hair loss. The most that can honestly be said is that some people believe regular use, especially infrared, may support the scalp through better circulation and lower stress — and that the research to confirm or rule that out has not been done.

Regular sauna use is best viewed as one comfortable component of a hair care routine rather than a standalone solution for hair growth or loss prevention.

Quick Facts About Hair Health and Saunas

• Moisture Loss: Long sessions in high dry heat can reduce the moisture content of the hair shaft, which is what makes hair feel brittle afterwards. No study has measured how much strength a sauna session costs a hair fibre, so there is no percentage to quote.
• Circulation: Therapeutic heat raises blood flow to the skin, including the scalp. The size of that change at the scalp has not been measured.
• Timing: In traditional Finnish-style sauna bathing a typical session runs 5 to 20 minutes. This is a description of common practice, not a medical recommendation — check with your healthcare provider if you are unsure what suits you.

Finally: How to Maximize Hair Health Through Smart Sauna Use

While saunas can be a great way to relax, protecting your hair from heat is worth the small amount of effort it takes. Using hair masks or deep conditioners, keeping sessions short, and staying well hydrated let you enjoy your sessions without leaving your hair parched.

The key lies in understanding your hair type, choosing the right sauna, and consistently implementing protective measures. Traditional saunas require more precautions due to their higher heat and lower humidity, while infrared saunas offer a gentler alternative when run at lower settings.

Frequently Asked Questions

Can sauna use cause permanent hair loss or thinning?

Sauna sessions are not established as a cause of permanent hair loss. Frequent, prolonged exposure to high heat can make pre-existing dryness or breakage worse, so take precautions if you already have hair loss concerns.

Are infrared saunas different from traditional saunas for hair?

Infrared saunas can be run at lower temperatures and deliver gentler heat, which may reduce surface dryness compared with a traditional sauna at the same session length. Either type can be used comfortably with proper hair protection.

What hair protection methods work best in the sauna?

Pre-apply a hair mask or deep conditioner, wear a towel or cap, and tie long hair up loosely. These steps help minimize heat exposure and moisture loss during the session.

Can an infrared sauna improve scalp circulation?

Heat increases blood flow to the skin, including the scalp. Whether that translates into any measurable hair benefit has not been established, so treat it as a comfort benefit rather than a hair treatment.

Is alternating sauna sessions with cold water safe for hair?

Many people alternate heat and a cool rinse and find it leaves the scalp feeling refreshed. Keep the temperature shifts moderate to avoid stressing sensitive hair or skin.

How long should sauna sessions be to avoid hair damage?

A 2025 review describes typical sessions in traditional Finnish-style sauna bathing as 5 to 20 minutes, and shorter, more frequent sessions are gentler than one long one. That is common practice rather than a prescription — your healthcare provider can advise on what is appropriate for you.

Does sauna type matter for preventing hair dryness?

Yes. Traditional saunas, with their high heat and low humidity, are more drying than an infrared cabin run at a lower setting.

Ready to enjoy safer, healthier sauna routines at home? Visit SunHomeSaunas today to explore our at-home wellness solutions, including home saunas. Or reach out to our team of wellness experts for personalized guidance.

References

1. Benke, E. (2025, May 21). Finland’s obsession with saunas is going global, but are they any good for you? Bbc.com; BBC. https://www.bbc.com/future/article/20250520-are-saunas-and-cold-plunges-good-for-your-health
2. Sastriques-Dunlop, S., Elizondo-Benedetto, S., & Zayed, M. A. (2025). Sauna use as a novel management approach for cardiovascular health and peripheral arterial disease. Frontiers in Cardiovascular Medicine. DOI 10.3389/fcvm.2025.1537194. (Source for the 5–20 minute typical session length, described for traditional Finnish-style sauna bathing.)
3. Natarelli, N., Gahoonia, N., & Sivamani, R. K. (2023). Integrative and mechanistic approach to the hair growth cycle and hair loss. Journal of Clinical Medicine, 12(3), 893. DOI 10.3390/jcm12030893. PMID 36769541. (Source for the link between follicular blood supply and the hair growth cycle. It reports no scalp perfusion figure.)
4. Kunchi, C., Venkateshan, K. C., Reddy, N. D., & Adusumalli, R. B. (2018). Correlation between mechanical and thermal properties of human hair. International Journal of Trichology, 10(5), 204–210. DOI 10.4103/ijt.ijt_24_18. PMID 30607039. (Source for heat damage to the hair fibre. It tests direct heating, not sauna exposure, and reports no percentage change in strength.)