MUC5AC and gastric ulcer: Polaprezinc, a chelating compound composed of zinc and L‐carnosine, has been found to promote the healing of gastric ulcers by enhancing the repair and protection of the gastric mucosa, reducing gastric acid secretion, and increasing mucin and bicarbonate secretion (Efthymakis and Neri 2022; Hewlings and Kalman 2020).