Reference Terms
from Wikipedia, the free encyclopedia

Vitamin D

Vitamin D is a fat-soluble steroid hormone precursor that contributes to the maintenance of normal levels of calcium and phosphorus in the bloodstream.

Strictly speaking, it is not a vitamin since human skin can manufacture it, but it is referred to as one for historical reasons.

It is often known as calciferol.

Note:   The above text is excerpted from the Wikipedia article "Vitamin D", which has been released under the GNU Free Documentation License.
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August 4, 2015

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updated 12:56 pm ET