This magnesium oxide supplement supplies promotes improved muscle and nerve functioning and can also help improve the functioning of your bones, heart and cells. Active Ingredient: Magnesium 240 mg, Each tablet contains 400 mg of magnesium oxide, equivalent to approximately 240 mg of elemental magnesium Serving Size of Active Ingredient: Adults-Take 1 to 2 tablets daily. Purpose: Nutritional Supplement Inactive Ingredients: microcrystalline cellulose. Contains less than 2% of: magnesium stearate, polyvinyl alcohol, titanium dioxide, PEG, talc, carnauba wax and may contain hypromellose, hydroxypropyl cellulose, sodium citrate. Store at room temperature