Our bodies create vitamin D when ultraviolet rays in sunlight convert a protein called 7-dehydrocholesterol in the skin into a type of vitamin D known as vitamin D3. When sunlight is sparse during ...

This article was reviewed by Brian Tanzer, nutritionist and Director of Scientific and Regulatory Affairs at The Vitamin ...

By Carl E. Bartecchi, M.D. What supplements waste our money?The government and the FDA haven’t helped us with this problem.