Calcium Supplement. 600 mg of calcium per tablet. Gluten free. Highest level of vitamin D3 (Per tablet, among leading calcium supplement brands). Helps maximize calcium absorption. Helps slow the rate of bone loss (Adequate Calcium and Vitamin D throughout life, as part of a healthy lifestyle, may reduce the risk of osteoporosis and related fractures). Maintain strong bones. Nourish your bones! www.caltrate.com. Facebook: Join us on Facebook. Questions? Comments? Call 1-800-282-8805. For most recent product information, visit www.caltrate.com. (These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.)