Magnesium Oxide 400 mg USP. No. 1 doctor recommended. 35% smaller tablet than magnesium chloride with four times the magnesium per tablet. Sugar and gluten free. 241.3 mg elemental magnesium per tablet. Why Mag-Ox 400? Pharmaceutical grade quality. Contains most concentrated form of magnesium. Contains no sugar, gluten, sodium, lactose, or preservatives. Formulated for optimal absorption. Small tablet, easy to swallow. 1 Mag-Ox 400 tablet has the same amount of magnesium found in these foods: 6 cups of broccoli or 7 medium bananas or 10 cups of spinach. The importance of normal magnesium intake: Essential mineral needed by every cell in your body; Helps maintain normal muscle and nerve function; Helps keep heart rhythm steady; Helps maintain normal blood pressure; Helps maintain bone strength; Helps in the absortion of calcium and potassium. Signs of magnesium deficiency: Depression; Abnormal heart rhythms; Muscle and leg cramps; Migraines. Reasons for a magnesium deficiency: Dietary Intake - 90% Americans don't get enough magnesium in their diets; Prescription Drugs - Diuretics, cisplatin, cyclosporine, and antibiotics; Health Conditions - Cardiovascular disease, high blood pressure, pre-diabetes, and diabetes are commonly associated with a magnesium deficiency.