![]() This is the form that is measured in blood tests. The ultraviolet (UV) rays from sunlight convert cholesterol in your skin into vitamin D3 ( 1).īefore your body can use dietary vitamin D, it must be “activated” through a series of steps ( 1).įirst, the liver converts dietary vitamin D into the storage form of vitamin D. However, sunlight is the best natural source of vitamin D3. Vitamin D3 (cholecalciferol): found in animal foods like salmon, cod, and egg yolks. ![]() Vitamin D2 (ergocalciferol): found in plant foods like mushrooms.There are two main forms of vitamin D in the diet: These vitamins are absorbed well with fat and are stored in the liver and fatty tissues ( 6). Vitamin D belongs to the family of fat-soluble vitamins, which include vitamins A, D, E, and K. What is vitamin D and why is it important?
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