Vitamin D3 Capsules (5000 IU)High potency, 5,000 IU. Vitamin D is inadequate in many individuals and daily need appears to be higher than previously thought. Vitamin Ds role in calcium metabolism and bone health is well known. However, it has many other important physiologic roles that are not as well appreciated. Vitamin D receptors are widely distributed in the body, including colon, prostate, breast and ovary, where it acts to inhibits the excessive growth of body cells and