The American Journal of Medicine conducted a meta-review of all the studies on sauna use and concluded that sauna use is safe and has therapeutic value. Infrared heat is so safe, hospitals use similar heaters to warm newborns.

On the other hand, sweating in a sauna can be used to excess, especially if you don’t replace lost fluid and become dehydrated. You could risk fainting and injury. Be sure you drink water before, during, and after sauna use. Using your sauna 30-45 minutes a day is plenty.