Solgar Calcium Citrate with Vitamin D3 is a high potency formula combining calcium citrate with Vitamin D3. Calcium absorption requires Vitamin D, a fat-soluble vitamin. Calcium is the mineral which is most present in our body and is stored mainly in our bones. It is required for strong and healthy bones, and teeth. As we age the absorption of calcium decreases, so there's even more reason that we should make sure we have enough calcium in our diet by eating dairy products such as milk, yogurt and cheese. Intake of adequate Calcium levels as part of a healthy diet, along with Vitamin D, contributes to the maintenance of normal bones and teeth.