Stimulated by the heat, blood flow is increased, the pores are opened, and wastes such as lactic acid are excreted, producing a cleansing or detoxifying effect.
Kuumuse mõjul suureneb verevool, avanevad poorid ning erituvad sellised laguproduktid nagu piimhape, mistõttu saun avaldabki puhastavat ja mürkaineid eemaldavat toimet.