Chronic use of saunas, and to some extent hot baths, may benefit the innate immune system.

“if you are already very heat adapted because you do sauna regularly or you exercise regularly well then it's going to take a stronger stimulus or more sauna either longer or hotter or more frequent to get the sorts of increases in innate immune response as compared to someone who's never done sauna who's not exercising regularly”

“is the use of deliberate heat exposure in particular sauna there's a nice study on this that was published very recently 2023 the title of the study is the effects of a single and series of finished sauna sessions on the immune system response and heat shock protein 70 levels in trained and untrained men”

“You know, I try to do it four times a week. But it's fascinating that that could actually be helping my innate immune system. And I think there's other studies that have shown effects as well”