Sodium alginatesodium bicarbonatecalcium carbonateworks in 2 waysfast powerful relief heartburn amp indigestiongaviscon double action mint brings long lasting relief from the pain and discomfort of heartburn and acid indigestion it gets to work in two different ways1 neutralising excess stomach acid to relieve pain and discomfort2 forming a protective barrier over the stomach contents to soothe the burning pain in your chest