Required for proper cell growth and immune functions.
Your Recommended Dietary Allowances (RDA) of Vitamin D is 6 000IU, but some thoughts are more like 10 000 to 40 000IU.
Best Sources of Vitamin D: Cod Liver Oil, Sushi (raw fish specifically), Canned Fish, Oysters, Caviar, Tofu, Soy Milk, Ham, Salami, Sausage, Eggs and Mushrooms.