(a pro-hormone named calcifediol aka calcidiol) Vitamin D3 is a biologically inactive pre-hormoneįirst in the liver (on carbon 25) to form 25-hydroxyvitamin D Similar to steroids (but with "broken" rings) ![]() Structually, Vitamin D consists of a group of fat-soluble molecules called secosteroids The ability to convert 7-dehydrocholesterol into vitamin D in the skin decreases with age. Most efficient at ultraviolet (UV) wavelengths Photochemical cleavage of cutaneous 7-dehydrocholesterol ![]() Vitamin D3 (cholecalciferol) is synthesized by human skin through the process of photosynthesis. ![]() Which (when activated by Vitamin K) shuttle calcium ions: Vitamin D stimulates the production of Vitamin K-dependent proteins (VKDP's),
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