How to get vitamin D refers to both ergocalciferol (Vitamin D2) and cholecalciferol (vitamin D3). Due to exposure to sunlight, ergocalciferol is formed from ergosterol in yeasts and plants, while cholecalciferol is synthesized from 7-dehydrocholesterol (7-DHC) humans and animals. The metabolically active form in the body from vitamin D2 and vitamin D derives 1,25-dihydroxy vitamin D or calcitriol. For what has just been said, vitamin D is a micronutrient with very peculiar characteristics: in fact, the coverage of its metabolic needs can be independent of the diet.
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