The use of antacids, such as calcium carbonate for rapid relief from occasional heartburn, is proven. Calcium carbonate is a common substance found in rocks in all parts of the world, and it is the main component of the shells of marine organisms, snails, pearls, and eggshells. Chemically, it is a base. When an acid, such as stomach hydrochloric acid, mixes with a base, it produces a neutral salt and water as a byproduct.

The base is a substance that accepts protons. The negative carbonate ion bonds with the positive hydrogen ions of the acid and gives the desired effect. However, it may slow down food digestion when used alone, because the enzymes secreted by the stomach only function in acidic pH.

• Protease: for protein digestion
• Amylase: for carbohydrate digestion
• Lipase: for fat digestion