Do saunas decrease cortisol levels?

Yes, saunas can decrease cortisol levels. Andrew Huberman discusses a study that found that repeated sauna use leads to a significant decrease in cortisol, which is a stress hormone. This decrease was noted in young adult men and suggests that saunas can be beneficial in reducing stress hormone levels. However, the study did not find changes in other hormones like testosterone, DHEA, or prolactin 1. Additionally, another study involving a specific sauna and cooling protocol also indicated a significant decrease in cortisol, further supporting the role of saunas in managing stress 2.