NOW® Gastro Comfort™ features the clinically tested ingredient PepZin GI™, which is a proprietary form of zinc complexed with carnosine that has been shown to support the integrity of the stomach lining. Gastro Comfort also includes mastic gum, a resin from the mastic tree, which has traditionally been used to maintain gastric health. In addition, this product has slippery elm and aloe vera to support a healthy digestive system.