The #1 Physician Recommended Brand Contains the recommended dosage of calcium and vitamin D to fight osteoperosis. Caltrate® 600+D3 supports healthy bones, joints, and muscles and has the highest level of Vitamin D3. Each tablet contains 600 mg of calcium and 800 IU of Vitamin D3. Calcium plays an important role in bones, nerves, hormones, muscles and teeth. Plus, advanced levels of Vitamin D3 help to maximize calcium absorption. Caltrate® 600+D3 helps keep your bones strong and your body moving. Caltrate® is Doctor Recommended and the #1 calcium supplement brand.