Vitamin D3 is an essential fat-soluble vitamin found in certain foods and produced by the body when exposed to sunlight. It is a critical nutrient required to keep your body functioning properly. Taking a Vitamin D supplement can promote calcium absorption, facilitating the development and maintenance of strong bones and teeth. It also supports muscle function, immune system modulation, hormone regulation, gene expression, and overall cellular health. Vitamin D3 has been shown to be the most potent and easily absorbed form of Vitamin D.