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 that it is wise to limit sun exposure to the skin. Supplemental vitamin d is another option in helping replenish vitamin d status. Futurebiotics vitamin d3 supplies 5000 iu of vitamin d as cholecalciferol, the preferred form. And, futurebiotics vitamin d3 is solubilized in oil for better absorption. Research has shown that vitamin d supports bone, colon, muscle, immune, and breast health.