Collagen has two key amino acids, glycine and proline, which have been shown to help heal the stomach lining and the intestinal wall. Additionally, collagen can regulate gastric juice secretion and prevent the excess of those juices. Collagen makes for a great digestive aid as well. Supplementing with collagen can prevent and/or provide relief a variety of gut complications, including ulcers, leaky gut syndrome, and inflammation of the gut wall.