Vitamin D is a fat-soluble vitamin that plays a crucial role in maintaining healthy bones and teeth. It helps the body absorb calcium and phosphorus, which are essential minerals for bone health. The body can produce vitamin D when the skin is exposed to sunlight, but it can also be obtained from certain foods and supplements. There are two main forms of vitamin D: D2 (ergocalciferol) and D3 (cholecalciferol). D2 is found in some fungi and yeast, while D3 is produced in the skin and is also found in animal-based foods like fish and egg yolks. Adequate levels of vitamin D are important for overall health and immune function.