Betaine hydrochloride bitters pepsin and gentian contains three nutritional factors which perform complementary functions designed to support digestion. Betaine hydrochloride supplement may improve stomach function. Pepsin is an enzyme produced by the body to digest protein foods in the stomach. Pepsin acts together with stomach acid , ensuring the digestion of proteins. Gentian is a herb which promotes digestion and tones the digestive tract. Its bitterness stimulates the body's production of digestive enzymes.