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. Vitamin D3 is the element produced by the skin upon exposure to sunlight. It is the element that is essential for the development and maintenance of bones and bone density. Vitamin D3 is only produced after the skin has been exposed to ultraviolet radiation.
Once this happens, vitamin D3 goes to the liver where it is converted into a more complex form of vitamin D3, 25-Hydroxyvitamin D3. This compound then goes to the kidneys where it is further broken down into a hormone-like substance used for the repair and maintenance of bones.
However, it is not abundant in food. As more and more people avoid sun exposure, the supplementation of vitamin D becomes even more necessary to ensure its adequate amount in the body.
Considering how important vitamin D is for strong bones, healthy cognitive function, cellular growth, and immune system function, it is very important to make sure that the body's needs are met. NOW Vitamin D-3 can be taken on its own or added to juices, protein drinks, or other healthy beverages. Vitamin D3 (cholecalciferol) is easily absorbed, utilized by the body, and has extremely low toxicity.
11 
