Calcium is an important mineral for bone health. Vitamin D3 is added to assist with Calcium absorption. †Os-Cal® is a registered trademark of GlaxoSmithKline, Pittsburgh, PA 15230 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.