Dr. Weston Price and the ideal human diet

... was not a fan of artificial vitamins. He wrote that an isolated, single form of a vitamin (he used the example of Vitamin D) is not how it occurs in nature. Vitamin D is actually a combination of several (poorly understood) factors whose function ...

http://bangordailynews.com/2013/08/29/health/dr-weston-price-and-the-ideal-human-diet/