Benefits of vitamin dVitamin D is found naturally in a variety of foods, such as milk, eggs, fish and cod liver oil. The sun also provides vitamin D, and individuals who are exposed to the sun for just a small amount of time can receive an adequate amount of vitamin D to avoid deficiencies. Individuals who are not receiving enough vitamin D or who desire to receive more can take vitamin D supplements for an additional source.Benefits of Vitamin DVitamin D is essential for maintaining good health. Vitamin D works together with calcium to build strong bones and teeth. Vitamin D also plays a vital role in regulating the immune system and the life cycle of cells in the human body. Studies have also shown that vitamin D promotes breast health. Vitamin D is also beneficial in treating certain diseases, such as autoimmune disease, high blood pressure, flu, osteoporosis and neuromuscular diseases.Individuals at Risk of Vitamin D DeficienciesCertain individuals are at risk of developing vitamin D deficiencies. Dark skinned people have a higher risk of not getting enough vitamin D because darker skin absorbs less vitamin D from the sun than light skin. This is especially essential for people living northern climates. Other groups at risk include older individuals, babies who are exclusively breastfed, people who do not receive enough sunlight and individuals who cannot properly absorb fat. Vitamin D is a fat soluble vitamin. People with Crohn's disease, cystic fibrosis, some forms of liver disease and celiac disease typically suffer from the inability to absorb fat.Diseases Linked to Vitamin D DeficienciesVitamin D deficiencies have been linked to several diseases, such as breast cancer, colon cancer, depression, weight gain and Heart disease. People who take vitamin D supplements have a lower risk of developing these diseases. Vitamin D supplements can be purchased at pharmacies, health food stores and grocery stores.