Vitamin D is a fat soluble essential nutrient for the body. Vitamin D is produced through skin exposure to sunlight, which triggers vitamin D synthesis, however, despite the importance of the sun to vitamin D synthesis, many experts agree it is wise to limit sun exposure to the skin. Supplemental vitamin D is another option in helping to replenish vitamin D status. Futurebiotics Vitamin D3 supplies 2000 IU of vitamin D as cholecalciferol, the preferred form. And, Futurebiotics Vitamin 3D is solubilled in oil for better absorption. Research has shown that vitamin D supports bone, colon, and muscle and breast health.