Vitamin D is essential to the human body and has a direct effect on the expression of more than 1,000 genes in most of our cells27.

Huberman mentions in his interview with Rhonda Patrick (at 1:25:30) that he takes 5,000 to 10,000IU of vitamin D per day, and says his vitamin D levels are within range on blood tests.

It’s worth noting the multivitamin he takes, mentioned below, contains 1,500 IU (37.5 mcg) per serving (3 capsules).