Gluten FreeBone Health Support. 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 immune function. Adequate Calcium and Vitamin D3 as part of a healthful diet, along with physical activity, may reduct the risk of osteoporosis in later life. No added Sugar, Yeast, Preservatives or Artificial Flavors. Gluten free. 21st Century Vitamins and Supplements are manufactured in a cGMP facility.