Other Information: Each Tablet Contains: calcium 320 mg and magnesium 2 mg. Store at 68-77 degrees F (20-25 degrees C). Keep the container tightly closed. Does not meet USP for assay. Misc: Calcium carbonate 750 mg. Starts working in seconds. Quality guaranteed. Compare to Tums Smoothies active ingredient (This product is not manufactured or distributed by GlaxoSmithKline, distributor of Tums Smoothies). Gluten free. www.topcarebrand.com.