Vitamin D3, Cholecalciferol is a fat soluble vitamin which helps body absorb calcium and phosphorus. Naturally Vitamin D3 is present in very few foods and is essentially required by our body for normal mineralization of our bones. Though it is found in some foods like fish, liver, egg, milk and fortified products but sunlight is an abundant source of Vitamin D3. On entering our body, it gets converted into its activated form and triggers the absorption of calcium and phosphorus. Deficiency of vitamin D3 is very prevalent among us which might lead to weak bones and skeletal deformities. Due to less dietary sources, opting a Vitamin D3 supplement can be a wise option for good health and to prevent it's deficiency.