Description (5,000 UI)
Vitamin D is a fat-soluble vitamin that is essential for maintaining normal calcium metabolism and for maintaining a healthy immune system. Although Vitamin D3 (cholecalciferol) can be synthesized by humans in the skin upon exposure to ultraviolet-B (UVB) radiation from sunlight and can be obtained from the diet, a deficiency often exists, especially during seasons of less sunlight or in northern climates.