Magnesium [Chemical/Ingredient] C0024467 A metallic element that has the atomic symbol Mg, atomic number 12, and atomic weight 24.31. It is important for the activity of many enzymes, especially those involved in OXIDATIVE PHOSPHORYLATION. Magnesium 6574 D008274 Magnesium C23018 M0012884 Magnesium N0000006335 Metals, Alkaline Earth [Chemical/Ingredient] Metals, Light [Chemical/Ingredient]