The sauna has been a cornerstone of Finnish culture for over 2,000 years. It has been used by indigenous peoples across Scandinavia, Russia, and the Baltic states as both a physical and spiritual practice. And in the last decade, it has become one of the most researched wellness interventions in the world, with epidemiological data from Finland showing associations between regular sauna use and dramatically reduced cardiovascular disease mortality, dementia risk, and all-cause mortality.
Understanding what sauna actually does to the body — and specifically to skin — helps athletes use it as the powerful tool it is rather than a luxury amenity.
The Physiology of Sauna Exposure
When you enter a sauna at 80 to 100 degrees Celsius, the body begins a cascade of physiological responses:
Core temperature rise. Core body temperature increases by 1 to 2 degrees Celsius during a typical 15 to 20 minute sauna session. This temperature elevation activates heat shock proteins — molecular chaperones that protect and repair other proteins from heat damage. Heat shock proteins also activate in response to exercise, which is part of why sauna produces exercise-like adaptations.
Cardiovascular response. Heart rate increases to 100 to 150 beats per minute in a typical sauna session — comparable to moderate aerobic exercise. Cardiac output increases. Blood volume is redistributed toward the skin for cooling. The cardiovascular stress of regular sauna use produces cardiovascular adaptation including improved endothelial function and reduced arterial stiffness.
Sweating. The primary cooling mechanism in sauna is sweating. A 15 to 20 minute session typically produces 0.5 to 1 liter of sweat. This sweat is not just water — it contains metabolic waste products, trace heavy metals, and the cellular debris that the body eliminates through this channel.
Growth hormone release. Research has shown that sauna use — particularly repeated sessions over several days — produces significant growth hormone elevation. One study found 16-fold increases in growth hormone after repeated sauna sessions. Growth hormone is the primary driver of cellular renewal and repair, including skin cell renewal.
Endorphin release. The mild euphoria and relaxation following sauna use reflects beta-endorphin release, similar to post-exercise endorphin activity.
What Sauna Does to Skin Specifically
The skin effects of sauna are among the most visible and immediate:
Pore opening. Heat and steam cause the most thorough pore dilation available outside of professional facial steaming. Pores that are genuinely open in this state are accessible to soap in ways they are not during normal washing. This is why the post-sauna shower is the highest-opportunity cleansing window in most people's routines.
Sweating as elimination. Sauna-induced sweating drives surface debris, excess sebum, and environmental contaminants toward the skin surface where they can be washed away. Regular sauna users typically report cleaner-looking skin and fewer breakouts — not coincidentally.
Increased circulation to skin. The blood redistribution of sauna exposure dramatically increases skin blood flow. After the sauna session, this elevated circulation persists and delivers increased oxygen and nutrients to skin tissue while removing metabolic waste more efficiently. The post-sauna glow is genuine increased skin blood flow.
Growth hormone and skin renewal. The growth hormone elevation from sauna use directly accelerates skin cell renewal, collagen synthesis, and the repair processes that maintain youthful skin structure. Regular sauna users show skin aging markers that are consistently more favorable than non-users of equivalent age.
The Post-Sauna Shower
The post-sauna shower is not just hygiene — it is the highest-value cleansing opportunity most athletes have. Pores are maximally open, skin is vasodilated, and the sweating process has brought debris to the skin surface.
Use this window with natural soap that delivers active ingredients to open pores. Our Activated Charcoal Black Bar Soap is ideal here — charcoal's adsorption mechanism reaches deepest when pores are fully open. Our Tea Tree Antibacterial Bar provides antibacterial coverage across skin that has been sweating for 20 minutes.
End with cold water. The contrast closes what the sauna opened and adds the circulatory benefits of cold exposure to the sauna's benefits.
Beyond Clean, Beyond Ordinary.