Magnesium is a mineral that is critical for energyproduction and metabolism, muscle contraction, nerve impulse transmission, and bone mineralization. It is a required cofactor for an estimated 300enzymes. Among the reactions catalyzed by theseenzymes are fatty acid synthesis, protein synthesis, and glucose metabolism. Magnesium status isalso important for regulation of calcium balancethrough its effects on the parathyroid gland. . Now magnesium citrate - 120 capsules (40 servings)