Vitamin D is Crucial for Athletic Performance

The proper type of Vitamin D supplementation is important By Michael Colgan, Ph.D. Vitamin D has become very sparse in the U.S. food chain. So the only good sources of supply of this very ancient essential nutrient are the manufacture of vitamin D in the body by skin exposure to sunlight and vitamin D supplements. Canada and other high latitude countries have insufficient sunlight, and a very high incidence of vitamin D deficiency (1-6). So, supplementation is the only answer. One other