Vitamin D obtained from sun exposure, foods, and supplements is biologically inert and must undergo two hydroxylations in the body for activation. ![]() It is also produced endogenously when ultraviolet (UV) rays from sunlight strike the skin and trigger vitamin D synthesis. Vitamin D (also referred to as "calciferol") is a fat-soluble vitamin that is naturally present in a few foods, added to others, and available as a dietary supplement. For a reader-friendly overview of Vitamin D, see our consumer fact sheet on Vitamin D.įor information on vitamin D and COVID-19, see Dietary Supplements in the Time of COVID-19. ![]() This is a fact sheet intended for health professionals.
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