Vitamin D is essential for building and maintaining healthy bones. It helps our bodies absorb calcium and phosphorus, which we need for our bones and teeth.Research is starting to show other health benefits from vitamin D in relation to immunity, cancer, cardiovascular disease, and diabetes. However, the evidence is inconsistent.It is important to meet the requirements for vitamin D intake all year round to help keep your body healthy. These are 20 of the richest sources of vitamin D to help you do just that!