Vitamin D - is a fat soluble vitamin who's most important role is maintaining adequate levels of calcium in the blood by increasing absorption of calcium from food and reducing calcium loss in the urine. Vitamin D also plays a role in blood cell formation and is involved in cell differentiation and insulin production. Deficiency is characterized by a softening of the bones. In children, Vitamin D deficiency is called rickets. Vitamin D is often fortified in foods and is found in cod liver oil. The majority of Vitamin D however is made in the body during a chemical reaction that starts with sunlight exposure to the skin.
Significant Food Source - self-synthesis via sunlight, fortified milk, egg yolk, liver, fatty fish
