How effective is citric acid as an antacid for treating heartburn and indigestion?

Citric acid is not commonly used as an antacid for treating heartburn and indigestion. It is more commonly found in foods and beverages as a flavoring agent. Antacids typically contain ingredients like calcium carbonate, magnesium hydroxide, or aluminum hydroxide to neutralize stomach acid. It is best to consult a healthcare professional for advice on the most effective treatment for heartburn and indigestion.