Mega-Mag Liquid Magnesium is a rich, natural source of concentrated magnesium ions with other minerals and trace elements that act as natural co-factors. VEGAN FORMULA.Magnesium is essential to over 400 different enzyme reactions and various other body functions. Magnesium ions (charged magnesium atoms) play a key role in nerve conduction, muscle contraction, bone and tooth formation, protein metabolism and are particularly important to heart and circulatory health. Research has shown many peoples diets to be deficient in magnesium.