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It is actually a hormone, a steroid hormone that is produced out of cholesterol when your skin is exposed to the sun.
For this reason, vitamin D is often referred to as the “sunshine” vitamin.
However, sun exposure is often inadequate these days, making it necessary for people to get more of it from the diet (or supplements).
This is important, because vitamin D is absolutely essential for optimal health (1).
Unfortunately, only a handful of foods contain significant amounts of this vitamin, and deficiency is extremely common (2, 3).
In fact, according to data from 2005-2006, a whopping 41.6% of the US population is deficient in this critical vitamin/hormone (4).
This article explains everything you need to know about vitamin D.
What is Vitamin D?Vitamin D is one of the fat-soluble vitamins (A, D, E and K), meaning that it dissolves in fat/oil and can be stored in the body for a long time.