Each caplet of Mag-Tab®SR contains 84 mg of elemental magnesium L-lactate dihydrate. 

Four 84 mg Mag-Tab®SR caplets daily contain 336 mg of elemental magnesium and will meet the USRDA

range for the average adult female and male (300-350 mg daily). Patients with kidney disease should not take

magnesium supplements without the advice and direct supervision of a physician.