More than 25 million adults in the United States have or are at risk of developing osteoporosis. Osteoporosis is most often associated with inadequate calcium intakes, but insufficient vitamin D contributes to osteoporosis by reducing calcium absorption. Recent studies suggest that vitamin D also plays a role in the prevention of colon, prostate, and breast cancers. Obtaining sufficient vitamin D from natural food sources alone can be difficult, since vitamin D is a fat-soluble vitamin that is naturally present in very few foods. Our Vitamin Dis a pharmaceutical grade supplement that provides 5000 IU of vitamin D3 (cholecalciferol) in each tablet.