Cholecalciferol, also known as vitamin D3, is a fat-soluble vitamin that plays a crucial role in maintaining healthy bones and teeth. It helps the body absorb calcium and phosphorus, essential minerals for bone health. Cholecalciferol can be obtained through sunlight exposure, certain foods, and dietary supplements. In the body, cholecalciferol is converted into its active form, calcitriol, which regulates calcium levels in the blood. A deficiency in cholecalciferol can lead to health issues such as rickets in children and osteomalacia in adults, highlighting the importance of adequate vitamin D3 intake for overall health.