Which vitamin is produced when a person is exposed to sunlight?

When a person is exposed to sunlight, specifically ultraviolet B (UVB) rays, their skin synthesizes Vitamin D. This process begins with the conversion of a cholesterol derivative in the skin, known as 7-dehydrocholesterol, into Vitamin D3 (cholecalciferol). This form of Vitamin D is then further processed by the liver and kidneys to form the active hormone calcitriol, which plays a crucial role in calcium metabolism and bone health.

Vitamin D is vital for several bodily functions, including the regulation of calcium and phosphorus, which are essential for maintaining healthy bones and teeth. While other vitamins like A, C, and E serve important functions, they are obtained through dietary sources rather than synthesized by the body through sunlight exposure. Thus, Vitamin D is unique in this regard, highlighting its importance in relation to sunlight and overall health.