NOW Magnesium Caps 400 mg 180 CapsulesBrand: NOW Features: SUPPORTS ENERGY PRODUCTION: Magnesium is a mineral that is critical for energy production and metabolism, muscle contraction, nerve impulse transmission, and bone mineralization. CRITICAL FOR ENZYME FUNCTION: 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. CLASSIFICATIONS CERTIFICATIONS: Kosher, Vegan, Soy