Gastric Mucin is a natural glycoprotein substance extracted from the gastric mucosa of animals (such as pigs or cows). It is one of the main structural and protective components of the gastric mucus layer. As a valuable biological product with a long history of medicinal use, gastric mucin is regarded as a "gastric mucosal protectant" in traditional and modern medicine. Modern research has confirmed that it possesses various biological activities, including cytoprotective, anti-ulcer, mucosal barrier-repairing, and anti-inflammatory properties.