What is Vitamin D?

Vitamin D is a fat-soluble vitamin that is found rarely naturally occurring in foods, found more often added to foods, and found in supplements. Our body produces Vit D when our skin is exposed to UV rays from the sun which trigger Vit D synthesis. Vit D that is ingested or made in our skin is not biologically active until it undergoes two reactions in the body to convert it first to 25-hydroxyvitamin D (25-OH D) in the liver and then a second reaction in the kidney to the active form called 1,25-dihydroxyvitamin D (1,25-OH2D).

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