ANATOMY

Detailed explanation-1: -Vitamin D is actually a hormone rather than a vitamin; it is required to absorb calcium and phosphate from the gut into the bloodstream. Vitamin D is mostly produced in the skin in response to sunlight and is also absorbed from food eaten (about 10% of vitamin D is absorbed this way) as part of a healthy balanced diet.

Detailed explanation-2: -Upon exposure to ultraviolet-B radiation, previtamin D3 is synthesized in keratinocytes of the epidermis. Previtamin D3 isomerizes to form vitamin D3 (cholecalciferol), which is subsequently transported into the circulation or metabolized by keratinocytes.

Detailed explanation-3: -Vitamin D is the sunshine vitamin that has been produced on this earth for more than 500 million years. During exposure to sunlight 7-dehydrocholesterol in the skin absorbs UV B radiation and is converted to previtamin D3 which in turn isomerizes into vitamin D3.

Detailed explanation-4: -The skin is responsible for producing vitamin D. During exposure to sunlight, ultraviolet radiation penetrates into the epidermis and photolyzes provitamin D3 to previtamin D3. Previtamin D3 can either isomerize to vitamin D3 or be photolyzed to lymisterol and tachysterol.

Detailed explanation-5: -Descriptions. Cholecalciferol is a dietary supplement that is used to treat vitamin D deficiency. It is also used with calcium to maintain bone strength. This medicine is available both over-the-counter (OTC) and with your doctor’s prescription.