Vitamin D is a fat-soluble vitamin that can be obtained through the diet or synthesized in the skin upon exposure to sunlight. Vitamin D3, the form of vitamin D formed in the skin, is a potent and active form of the vitamin. Vitamin D2 is a vitamin D analog formed in plants, mushrooms and yeasts during photosynthesis. While vitamin D2 is sometimes used in food fortification, Puritan?s Pride supplements provide the active form.
Vitamin D plays a regulatory role in the growth, differentiation, and proliferation of different types of white blood cells. It is important to regulate these processes to maintain immune balance.
The T and B cells of the adaptive immune system are both regulated by vitamin D. Many cells of the innate immune response also require vitamin D such as monocytes which need it to mature properly. Adequate concentrations of vitamin D are also necessary for the synthesis of important proteins with immune-fighting properties.