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. Futurbiotics vitamin d3 provide 2000iu of vitamin d as cholecalciferol, the preferred form. Research has shown that vitamin d supports bone, colon, muscle, immune and breast health.