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Question: 1 / 495

The main source of Vitamin D for humans is?

Dietary intake

Sunlight exposure

Vitamin D is unique among the vitamins because a significant portion of it is synthesized by the body itself when skin is exposed to sunlight, specifically ultraviolet B (UVB) rays. This process is often regarded as the primary source of Vitamin D for humans. When UVB rays strike the skin, they convert 7-dehydrocholesterol into vitamin D3 (cholecalciferol), which is then metabolized by the liver and kidneys into the active form of Vitamin D.

While dietary intake, supplements, and fortified foods can contribute to Vitamin D levels, sunlight exposure remains the most effective and primary source for the majority of individuals. For people who live in areas with limited sunlight or who spend most of their time indoors, dietary sources and supplements become increasingly important. However, in general, the synthesis of Vitamin D through sunlight is the most efficient way the body obtains this crucial vitamin.

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Supplements

Fortified foods

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