Andrew Huberman· PhD
But the skin is an endocrine organ. It has the capacity to make things that impact hormones and to make hormones. There's this beautiful study out this last year. This took place over in Israel, where they had people get outside for 20 or 30 minutes a day, three times a week, exposing a culturally acceptable yet substantial amount of their skin during that time, and saw big increases in testosterone and estrogen.