Calcium is an important mineral for supporting bone health. Calcium also works to support muscle and nerve function. Vitamin D3 is added to assist with Calcium absorption and as support for the immune system. Adequate Calcium and Vitamin D3 as part of a healthful diet, along with physical activity, may reduce the risk of osteoporosis in later life. No added sugar, yeast, preservatives or artificial flavors. 21st Century Vitamins and Supplements are manufactured in a cGMP facility under the strictest standards for product quality, including potency and purity. 21st Century prides itself on providing you with a great product at the best value. Os-Cal is a registered trademark of GlaxoSmithKline, Pittsburgh, PA 15230 This statement has not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.