Here are a few supplements that support the stomach lining and help with heartburn: L-glutamine, an essential amino acid, maintains intestinal lining integrity and supports digestion, potentially alleviating heartburn by healing esophageal mucous membranes and reducing gastrointestinal inflammation. Slippery elm contains mucilage, soothing the digestive tract, forming a protective barrier against stomach acid, and relieving heartburn and acid reflux. DGL (deglycyrrhizinated licorice), processed to remove glycyrrhizin, stimulates mucus production, safeguards the stomach lining, and aids in healing gastric ulcers, contributing to heartburn management and overall gastric health.