Sodium bicarbonate reduces stomach acid. It is used as an antacid to treat heartburn, indigestion, and upset stomach. Sodium bicarbonate is a very quick-acting antacid. Anise oil can be attributed to its properties as an anti-epileptic, anti-hysteric, anti-rheumatic, antiseptic, antispasmodic, aperient, carminative and digestive substance. Peppermint oil seems to reduce spasms in the digestive tract.

Menthol provides soothing effect on esophagus. Menthol, the primary active component of peppermint oil, soothes the stomach primarily by acting as a smooth muscle relaxant and reducing spasms in the gastrointestinal (GI) tract.