Acid reflux may seem common, but frequent heartburn could be a sign of Gastroesophageal Reflux Disease (GERD). If left untreated, it can lead to chest pain, esophageal inflammation, and even precancerous changes. Glutathione and Side Effects: What You Need to Know for Better Health Performance Lab Frontiers Vitamin B5 and vitamin U review: justification of combined use for the treatment of mucosa associated gastrointestinal pathologies Frontiers The role of the esophageal and intestinal microbiome in gastroesophageal reflux disease: past, present, and future