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.
For more information about the topic Vitamin D, read the full article at Wikipedia.org, or see the following related articles:
Editor's Note: This article is not intended to provide medical advice, diagnosis or treatment.
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