Which vitamin is synthesized in the skin?

Vitamin D is synthesized in the skin through a biochemical process that involves exposure to ultraviolet (UV) radiation from sunlight. When the skin is exposed to UVB rays, a cholesterol derivative in the skin (7-dehydrocholesterol) undergoes a transformation into previtamin D3, which is then converted into active vitamin D through further processes in the liver and kidneys.

Vitamin D plays a vital role in calcium absorption, bone health, and immune function. The ability to synthesize this vitamin in the skin is particularly important in maintaining adequate levels, especially for individuals who may have limited sun exposure. In contrast, vitamins A and E, while also important for health and available from dietary sources, are not synthesized in the skin. Vitamin C is predominantly obtained through dietary intake and is not produced in significant amounts by the body or skin. Thus, the distinction lies in the unique ability of the skin to produce vitamin D in response to sunlight, making it essential for overall health and wellbeing.