Adequate calcium as part of a healthful diet, along with physical activity helps support and maintains bone health. Adequate calcium is important for overall health. 21st Century provides you with 1,200 mg calcium with 800 IU vitamin D3 in each serving of their Calcium 600 + D supplements. Vitamin D is essential for use of calcium and necessary for healthy bones, teeth and cartilage. Calcium may also support a healthy colon. No added sugar, salt, yeast, preservatives or artificial flavors.