Pepsin is a digestive enzyme found in the gastric juice of the stomach. It changes proteins in food into substances called peptides. In chemical composition, pepsin is like other enzymes, but its effects are entirely different. Its activity is strongest in an acidic environment, such as that found in the stomach. Pepsin has no effect on fats or carbohydrates. It is produced commercially by drying the mucous lining of the stomachs of pigs and calves.
See also Digestive system (From mouth to stomach) ; Enzyme ; Stomach ; Ulcer .
