Magnesium Citrate, 180 Softgels, NOW FoodsNOW Foods Magnesium Citrate Dietary Supplement. Nervous System Support. Superior Bioavailability. With Glycinate & Malate. Magnesium is a mineral that is critical for energy production and metabolism, muscle contraction, nerve impulse transmission, and bone mineralization. It is a required cofactor for an estimated 300 enzymes. Among the reactions catalyzed by these enzymes are fatty acid synthesis, protein synthesis, and glucose metabolism. Magnesium