Vitamin D Deficiency
Vitamin D, also known as “calciferol,” is one of the four fat soluble (dissolve in fat) vitamins (A, D, E, and K) stored in body tissues. Vitamin D is the only vitamin that can be synthesized by the human body. Your own body can produce vitamin D in the skin when exposed to sunlight, namely the ultraviolet B radiation (UVB). Other sources of vitamin D include dietary supplements and food such as fortified milk, fortified cereals, fatty fish, cod-liver oil, mushrooms, and egg yolks.