Vitamin D is essential for maintaining healthy bones, teeth and muscles. Some synonyms for Vitamin D include Calciferol, Cholecalciferol, Ergocalciferol, Vitamin D2, Vitamin D3, and Sunshine Vitamin. Vitamin D is produced by the body when the skin is exposed to sunlight. However, it can also be obtained through certain foods such as fatty fish, egg yolks and fortified dairy products. A deficiency in Vitamin D can lead to a variety of health problems including weak bones, muscle weakness and increased risk of falls. Therefore, it is important to ensure an adequate intake of Vitamin D either through sun exposure or diet.