Vitamin D Deficiency

What is vitamin D?

The "sunshine" vitamin is a hot topic. Should people be exposed to the sun for their vitamin D? Are the guidelines for how much vitamin D we need adequate? Is the tolerable upper limit too low? What benefits does vitamin D have on our health? This article will discuss and respond to all of these common questions.

There are two forms of vitamin D, known as D2 and D3. Vitamin D2, also known as ergocalciferol, comes from fortified foods, plant foods, and supplements. Vitamin D3, also known as cholecalciferol, comes from fortified foods, animal foods (fish, eggs, and liver), and can be made internally when your skin is exposed to ultraviolet (UV) radiation from the sun. Vitamin D is a fat-soluble vitamin. This means that it is stored in our fat cells for use when it is needed. It is constantly being used for calcium metabolism and bone remodeling.

Reviewed on 6/18/2013