Answer ( 1 )

  1. Actually there are different forms of vitamin D in human body, it is involved in several metabolic steps.
    The epidermal layer, which is one layer of your skin, contains highly concentration of 7-dehydrocholesterol, a precursor of vitamin D.
    Under the sunlight, ultraviolet (especially the part of UV B radiation) will convert 7-dehydrocholesterol into vitamin D. These vitamin D will be carried to the liver in the bloodstream.
    In liver, vitamin D will be converted into calcidiol, and then transported to kidney in the bloodstream.
    In kidney, calcidiol will be converted into calcitriol, which is also called 1,25-dihydroxycholecalciferol, or 1,25-(OH)2 vitamin D3, an active form of vitamin D.
    Due to 1,25-(OH)2 vitamin D3 is the active form, it plays real effects in human body.

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