Calcium Supplement. Highly soluble, easily absorbed. New look! Defy bone aging with Citracal calcium and high level of vitamin D3. Adequate calcium and vitamin D throughout life, as part of a well-balanced diet, may reduce the risk of osteoporosis. Citracal Maximum is made with Calcium Citrate, a different kind of calcium: highly soluble, easily absorbed; can be taken with or without food; gentle on your digestive system. Questions or comments? Please call 1-866-511-9328.