Need to take your vitamin D supplementation up a notch? Switch to Nordic Naturals Vitamin D3 1000 - Orange, which delivers 1,000 IU (125% daily value) of vitamin D3 in each easy-to-swallow softgel. Vitamin D has long been known for its important role in regulating the body's levels of calcium and phosphorus, as well as increasing mineralization in the bones. Nordic Naturals vitamin D3 is cholecalciferol, the natural, most easily absorbed and utilized form of vitamin D.