Gas-X Total Relief Chews pairs our most powerful gas-fighting medicine with 250 mg of simethicone and 750 mg of heartburn-relieving calcium carbonate per tablet. Wrapped in a tasty outer shell with a soft center, these chews provide great-tasting, dual-action relief on contact*.
Calcium carbonate is a chemical compound commonly found in nature that targets and neutralizes heartburn-causing acid in the esophagus and stomach on contact, providing heartburn relief.