Digestive Acids Exploring Digestive Acids: Foundation of Digestive Health An effective digestive process requires the secretion of an appropriate amount of digestive acids and enzymes, hydrochloric acid (also called HCL, HCL acid or betaine hydrochloride in supplement form), mucus, and bicarbonate. https://www.nationalnutrition.ca/digestive-supplements/digestive-acids.html #digestiveacids