Promote bone health with 21st Century 600 Calcium Supplement. Calcium is necessary for healthy bones, teeth and cartilage. The body stores most of its calcium in the bones. Calcium supplements help support bone health in young adults and help support bones in later years. Adequate calcium as part of a healthful diet, along with physical activity, helps support bone health and maintenance. This formula contains no added sugar, yeast, preservatives or artificial flavors.