SUNLIGHT
do NOT forget the Sun
In addition to vitamin D, the skin produces melatonin, serotonin, endorphins, endocannabinoids, cortisol, oxytocin, leptin, nitric oxide, cis-urocanic acid,
itaconate, lumisterol, tachysterol, and a dozen other vitamin D–like compounds that don’t even have names yet.
https://www.youtube.com/watch?v=2ksPzKMJgXs