NOW Magnesium Citrate (200 mg 250 tabs)NOW Magnesium Citrate 250 Tablet(s) NPN : 80005311 Magnesium is a mineral that is critical for energy production and metabolism, muscle contraction, nerve impulse transmission, and bone mineralization. It is a required co factor for an estimated 300 enzymes. Among the reactions catalyzed by these enzymes are fatty acid synthesis, protein synthesis, and glucose metabolism. Magnesium status is also important for regulation of calcium balance through its