Vitamin D3


	VITAMIN D3


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Learn About Vitamin D3

Vitamin D3 is also commonly known as Vitamin D and the two names are used interchangeably. Vitamin D3 is critical for the proper metabolism of phosphorous and calcium in the body.

The two most important forms of Vitamin D3 are cholecalciferol, which is the D3 component of Vitamin D, and ergocalciferol which is the D2 component of Vitamin D. The Vitamin D3 component of Vitamin D, cholecalciferol is the element that is manufactured by the skin from sunlight. It is this element that is necessary for the growth and maintenance of bones and bone density.

Vitamin D3 is only produced after the skin has been exposed to ultraviolet rays. Once this occurs, Vitamin D3 goes to the liver where it becomes a more complex form of Vitamin D3 -- 25-Hydroxyvitamin D3. This compound then goes to the kidney where it is further broken down to a hormone type substance that is used in the repair and maintenance of bone tissues.

It is the cholecalciferol component that is the element of Vitamin D3 that is supplemented during food fortification. Margarine is one food that is fortified with Vitamin D3, and in many countries this is mandatory so that they can be nutritionally close to butter. Milk is another food product that is regularly fortified with Vitamin D3. In 2004, researchers found that in healthy people, the absorption rates of ergocalciferol and cholecalciferol were fairly equal, but that cholecalciferol had as much as ten times more potency that ergocalciferol and also had longer lasting effects. Given this, researchers concluded that when using Vitamin D supplements, those containing Vitamin D3 were the most recommended.

Before taking any Vitamin D3 supplementation however, talk to your doctor as large doses have been known cause kidney failure and sometimes death. If you are taking large doses under a doctor's care, monthly blood work is required to prevent Vitamin D3 toxicity. Those with a preexisting kidney problem should avoid Vitamin D3 all together.

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