* Durk Pearson & Sandy Shaw"s * A Dietary Supplement 3-Way Calcium Complex with ABCD is formulated with three forms of calcium for high bioavailability, along with cofactors which help your body use calcium: A — Vitamin A, a nontoxic form (beta carotene), B — boron, C — Vitamin C, and D-Vitamin D. This formulation was designed by life extension scientists Durk Pearson & Sandy Shaw for their own daily use. Physical activity and adequate calcium intake throughout life, as part of a well-balanced diet, may reduce the risk of osteoporosis. Adequate calcium and vitamin D as part of a healthful diet, throughout life along with physical activity, may reduce the risk of osteoporosis in later life. Some scientific evidence suggests that calcium supplements may reduce the risk of hypertension. However, FDA has determined that the evidence is inconsistent and not conclusive.