Vitamin D is a fat soluble vitamin that plays a role in many important bodily functions. Vitamin D is best known for working with calcium in the body to build and maintain strong bones. Vitamin D also is involved in regulating the immune system and cell, which could help prevent cancer.

Rickets, a disease that causes soft and/or weak bones can result if a child has a vitamin D deficiency. It is important to get enough vitamin D as a child because most bone is formed when you are young. Vitamin D helps your body absorb calcium, which is used by the body to promote strong bones. Taking a vitamin D and calcium supplement can reduce the rate of bone loss and could help prevent osteoporosis. Vitamin D also protects against osteomalacia, which is a softening of the bones in adults.

Milk is a great source of vitamin D. If milk is not your thing, then getting direct sunlight exposure will help your body make vitamin D. It is recommended to get at least 45 minutes per week of direct sunlight for you body to make enough vitamin D.