Healthy With Age

Although our body produces vitamin D when we are exposed to sunlight, many of us still have deficiencies-especially if you live in mild or temperate climates. There are several variations of vitamin D, but D2 and D3 are the most relevant to humans. Vitamin D3 is also referred as cholecalciferol and is classified as a secosteroid, which is a molecule structurally similar to a steroid.

Vitamin D3 can be broken down into three categories, but calcitriol is the active form. Regulation of metabolism and other essential functions are made possible through vitamin D and a deficiency can affect these processes and heighten the risk of other diseases. If you have a deficiency, you best bet is to begin taking some sort of vitamin D3 supplement.