NOW Foods Slippery Elm 400 mg provides powdered inner bark of Ulmus rubra — one of the most renowned Ayurvedic and Native American demulcent herbs, used for centuries to soothe and protect irritated mucous membranes throughout the digestive tract. Slippery elm's mucilaginous polysaccharides form a slick, gel-like coating when mixed with water that coats the esophagus, stomach, and intestinal lining — providing immediate soothing relief for GERD, gastritis, esophageal irritation, IBS, and inflammatory bowel conditions. This gentle, protective effect makes slippery elm one of the most trusted herbs for any digestive condition involving mucosal irritation or inflammation. NOW Foods provides 400 mg of pure slippery elm inner bark per capsule, manufactured in their GMP-certified facility with botanical identity verification.