Magnesium - the vital mineral that is essential for your heart and good health. Helps your body utilize calcium & potassium, may be depleted by diuretics & other medications used to treat heart disease, and helps maintain function of the heart, GI tract & nervous system. (These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, cure or prevent any disease). The only 12 hour sustained release magnesium supplement. An essential mineral for people with heart disease and diabetes. Unsurpassed absorption for maximum benefits. Two Mag-Tab SR caplets provide 168 mg magnesium, 42% of the U.S. recommended daily value for adults and children 12 years of age and older.