Both are also naturally occurring forms that are produced in the presence of the sun’s ultraviolet-B (UVB) rays, hence its nickname, “the sunshine vitamin,” but D2 is produced in plants and fungi and D3 in animals, including humans. Vitamin D supplements are available in two forms: vitamin D2 (“ergocalciferol” or pre-vitamin D) and vitamin D3 (“cholecalciferol”). For most people, the best way to get enough vitamin D is taking a supplement because it is hard to eat enough through food. Many of the body’s organs and tissues have receptors for vitamin D, which suggest important roles beyond bone health, and scientists are actively investigating other possible functions.įew foods naturally contain vitamin D, though some foods are fortified with the vitamin. Also, laboratory studies show that vitamin D can reduce cancer cell growth, help control infections and reduce inflammation. It is a fat-soluble vitamin that has long been known to help the body absorb and retain calcium and phosphorus both are critical for building bone.
Vitamin D is both a nutrient we eat and a hormone our bodies make.
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