Sunlight and Vitamin D.

Dr. Michael Holick is the world's foremost authority on vitamin D and the healing power of natural sunlight. He's the author of The UV Advantage, and in this interview, Dr. Holick reveals fascinating facts on how vitamin D is created and used in the human body to ward off chronic diseases like cancer, osteoporosis, mental disorders and more. This is one of the most eye-opening interviews you'll ever read on health.