NOW Foods Magnesium Malate - 95mg of Elemental Magnesium: 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. Malate is an important Krebs cycle intermediate, indicating that it is an important molecule in the production of cellular energy derived from carbohydrates.