Vitamin D3 is converted into a steroid hormone that regulates approximately 5% of the human genome, including immune function.

“vitamin D is a steroid hormone that controls the expression of over a thousand different genes in the human body that's 124th of the human genome if 96% of adults in the United States not taking a vitamin and mineral supplement have inadequate levels of this essential steroid hormone one can probably assume there's going to be some substantial delerious effects on someone's health status and the converse is most likely true if vitamin D controls 124th of the human genome supplementation with vitamin D to bring your status back up to adequate levels most likely will have a positive benefit on someone's health”