Product Details Calcium carbonate 1000 mg. Relief of: Heartburn and acid indigestion. Compare to Tums Ultra Strength active ingredient (This product is not manufactured or distributed by GlaxoSmithKline, owner of the registered trademark Tums). Essential to Care since 1979. 100% money back guarantee. Return to place of purchase if not satisfied. www.myleader.com. Questions? 609-860-2600 (Ext: 700).