Medical Definition of Vitamin D3

Vitamin D3: A vitamin produced by the body when exposed to ultraviolet light or obtained from dietary sources. Vitamin D3 is a hormone that has an important role in calcium and phosphorus metabolism. Technically, vitamin D3 is not a vitamin because the body can produce it. Also known as cholecalciferol.

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QUESTION

According to the USDA, there is no difference between a “portion” and a “serving.” See Answer

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Reviewed on 12/21/2018