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 After absorption from foods or production in the skin, vitamin D is stored as 25-hydroxy- vitamin D3 in the liver.  However, vitamin D3 is the preferred form for humans as its bioavailability is twice that of vitamin D2. ( Ergocalciferol) VITAMIN D 2 (Cholecalciferol) VITAMIN D 3  Found in plant life  Synthesized in the body  Synthetically derived supplement  Naturally derived supplement  Moderately increases vitamin D levels in the body  Significantly increases vitamin D levels in the body  Alternative form appropriate for vegetarians  Recommended by experts for optimal bone and immune support Vitamin D2 (ergocalciferol) is another form of vitamin D synthesized by certain fungi and is used in many supplements. Vitamin D3 (cholecalciferol) is synthesized from 7-dehydrocholesterol in sun-exposed skin and found naturally in animal products such as eggs, fish and liver. The term “Vitamin D” refers to a family of related compounds biosynthesized from cholesterol and ergosterol. Presentation on theme: "Vitamin D, E & K Fat soluble vitamins.