Name a fat soluble vitamin manufactured by the human body?

Vitamin D is a fat-soluble vitamin that can be synthesized by the human body. When the skin is exposed to sunlight, specifically ultraviolet B (UVB) rays, it converts 7-dehydrocholesterol into vitamin D3 (cholecalciferol). This vitamin plays a crucial role in calcium absorption and bone health. However, adequate sunlight exposure and dietary sources are essential for maintaining optimal levels.