vitamin D3?

Question

what is the differance from plain vitamin D? and vitaminD3?

Answer 1

Cholecalciferol is a form of Vitamin D, also called vitamin D3. It is structurally similar to steroids such as testosterone, cholesterol, and cortisol (though vitamin D3 itself is a secosteroid).

1g of pure vitamin D3 is 40 000 000 (40x106) IU, or in other words, one IU is 0.025 μg.


Vitamin D refers to a group of fat-soluble alcohols that contribute to the maintenance of normal levels of calcium and phosphorus in the blood. The two major forms of vitamin D are D2 (or ergocalciferol) and D3 or cholecalciferol. Vitamin D is required for the formation of strong bones and teeth. It is manufactured in the skin by the activation of a sterol (7-dehydrocholesterol) by ultraviolet radiation (sunlight). Vitamin D is classified as a vitamin because it is required for metabolism and deficiency can result in disease, including rickets and osteoporosis
http://en.wikipedia.org/wiki/Vitamin_D#Overview

Answer 2

The two most important forms of vitamin D are cholecalciferol (D3), which is derived from our own cholesterol and ergocalciferol (D2), a plant analogue derived from the diet.

The cholecalciferol supplied by the Life Extension Buyers Club is synthetic, but its form is identical to that which is derived from cholesterol and synthesized by sunlight on the skin.

Cholecalciferol Vitamin D is essential for bone growth and maintenance of bone density.