Vitamin D (also referred to as “calciferol”) is a fat-soluble vitamin that is naturally present in a few foods, and available as a dietary supplement. It is also produced endogenously when ultraviolet (UV) rays from sunlight strike the skin and trigger vitamin D synthesis. As people spend more time indoors, VITAMIN D deficiency is becoming abundant. Vitamin D supplements are a go-to way to fill that nutritional gap. The bioavailability of vitamin D may differ among individuals due to variable absorption and metabolism in the body.
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