Turning Up the Heat: What Sauna Therapy Can Do for Whole-Body and Hair Health

For centuries, people have turned to saunas not just to sweat, but to feel better. Modern research suggests that regular sauna use may support cardiovascular and metabolic health, help reduce feelings of stress, improve skin barrier function, and enhance overall quality of life.^1,2

While there are different types of saunas—dry, infrared, and steam—they all work by creating a controlled heat response in the body. It’s this shared physiological response that may offer supportive benefits for scalp and hair health.

Research on sauna use suggests that its potential benefits for scalp and hair health are primarily supportive. Rather than directly stimulating hair growth, sauna use can help with supporting key systems in the body that influence hair growth cycles and shedding patterns.

Sauna use can increase circulation and blood flow throughout the body, including to the scalp.^1,2 Good blood flow helps deliver fresh oxygen and nutrients to hair follicles, which supports normal hair growth cycles and may help reduce shedding.³ Because hair follicles rely on a steady supply of these nutrients, habits that support circulation, like sauna use, may play a supportive role in overall hair health.

Both chronic stress and poor sleep are known to disrupt normal hair growth cycles, contributing to increased shedding.^²⁻⁴ Sauna use has been shown to reduce feelings of stress and support better sleep quality, which may indirectly benefit healthy hair growth and reduced shedding over time.^²ʳ⁴

Some modern saunas also incorporate red LED light therapy. In a recent study of individuals experiencing hair shedding, consistent use of red LED therapy was associated with reduced shedding and improvements in hair thickness and density.⁵ This makes LED light one of the few sauna features that may actually influence the hair follicle more directly.

While saunas can support hair and overall wellness, heat exposure can place stress on the hair if it’s not properly protected. Excessive heat can lift the hair cuticle, disrupting the smooth outer layer that helps hair retain moisture and shine. When the cuticle is compromised, hair may appear frizzier, more brittle, or rough in texture.⁶ Prolonged heat exposure increases sweating and fluid loss. Without replenishing fluids with regular sips of water, dehydration can set in.² Over time, this may leave hair feeling drier and less lustrous.

Humidity can add another layer of challenge, particularly in steam rooms. High heat combined with moisture can cause the hair shaft to swell, which may lead to frizz or loss of definition, especially for curly, wavy, textured, or chemically treated hair.⁷

Rinse sweat from the hair as soon as possible and follow up with gentle cleansing and moisturizing to restore softness and manageability.

Saunas offer great benefits for circulation, stress reduction, and overall relaxation, all of which can indirectly support healthy hair by influencing the systems that help support hair growth and shedding.^1,2

At the same time, unmanaged or excessive heat exposure can place stress on the hair itself. Just as repeated high heat from styling tools can disrupt the hair cuticle and lead to dryness or breakage, prolonged or unprotected heat exposure in a sauna may compromise hair integrity if protective steps aren’t taken.⁶

The good news is that with a few simple protective steps—like staying hydrated, minimizing direct heat exposure, and shielding the hair—it’s possible to protect hair quality while continuing to enjoy the whole-body benefits of sauna use that may support healthy hair growth over time.

Sauna use may support the conditions that promote healthy hair growth—particularly by improving circulation to the scalp and reducing stress, both of which influence the hair growth cycle.^1,2 Sauna use is best understood as a supportive lifestyle habit, rather than a direct hair growth intervention.

Sauna use itself is not known to cause hair shedding. However, excessive or unprotected heat exposure may place stress on the hair shaft over time.⁶ Staying hydrated, using a sauna hat, and applying a protective product beforehand can help minimize any impact on hair quality.

Most research on sauna health benefits is based on regular use, typically a few sessions per week. There is no established frequency specifically for hair health benefits; consistency with protective habits matters more than session frequency.

Both have potential systemic benefits that may support hair health, but also challenges for the hair itself.^1,2 Either requires considering protection against heat-induced cuticle stress, while steam rooms also require considering protection against humidity-induced swelling of the hair shaft.^6,7

Emerging research suggests consistent red LED light therapy may be associated with reduced shedding and improvements in hair thickness and density.^⁵ Of all sauna features, red LED light appears to have the most direct influence on hair follicle health.