Product Details Naturally and artificially flavored. Gluten free. Calcium carbonate USP, 500 mg. Relief of: Upset stomach, Heartburn, and Acid Indigestion. Compare to Tums Regular Strength active ingredients (This product is not manufactured or distributed by GlaxoSmithKline LLC, owner of the registered trademark, Tums Regular Strength). 100% money back guarantee. Return to place of purchase. www.myleader.com.