Each tablet provides 250mg of Magnesium. Functions of Magnesium: Magnesium contributes to a reduction of tiredness and fatigue Magnesium contributes to electrolyte balance Magnesium contributes to normal energy yielding metabolism Magnesium contributes to the normal functioning of the nervous system Magnesium contributes to normal muscle function Magnesium contributes to normal protein synthesis Magnesium contributes to normal psychological function Magnesium contributes to the maintenance of normal bones and teeth Magnesium has a role in the process of cell division