Vitamin D-3 helps the body absorb calcium. Calcium and phosphate are two minerals that are essential for normal bone formation. Throughout childhood, your body uses these minerals to produce bones. If you do not get enough calcium, or if your body does not absorb enough calcium from your diet, bone production and bone tissues may suffer. Research strongly encourages taking Vitamin D-3 to support healthy bones, a stronger heart and a healthier immune system. *One bottle contains 536 servings, each supplying 400 IU of Vitamin D-3 per serving which is 100% of you daily recommended value!