Acidity regulators, also known as pH control agents, are substances added to foods or medicines to maintain or alter acidity or alkalinity. In the context of supporting or treating acid indigestion (dyspepsia), common acidity regulators include compounds like sodium bicarbonate (baking soda), magnesium hydroxide, and calcium carbonate. These substances act as antacids, neutralizing excess stomach acid and providing symptomatic relief from heartburn and indigestion.

The use of these acidity regulators for acid indigestion is strongly supported by scientific evidence. Numerous clinical studies have demonstrated the efficacy of antacids in rapidly alleviating symptoms of acid indigestion, heartburn, and mild gastroesophageal reflux. For example, sodium bicarbonate reacts with hydrochloric acid in the stomach to form sodium chloride, water, and carbon dioxide, effectively reducing acidity and discomfort.

These compounds are included in many over-the-counter medications specifically marketed for acid indigestion and are recommended in clinical guidelines for the symptomatic treatment of dyspepsia. While antacids provide short-term relief, they do not address underlying causes of indigestion and are not intended for prolonged use without medical supervision. Nonetheless, their use as acidity regulators in treating acid indigestion is both scientifically validated and widely practiced.