PEPSIN

a ferment, or enzyme, related to the proteims, contained in the gastric juices of humans and other mammals. The commercial product is obtained from the mucous stomach-lining of the pig, calf, or sheep. It is useful medicinally as a digestive aid for children, invalids, and old people, but it should be remembered that it digests only albuminoids—as the casein of milk and the elief solids of lean meat and ezes—not fats or carbohydrates. Ignorance of thix is the cause of many disappointments when pepsin is used as a domestic remedy for indigestion. (See also Paxcrearin and reference in it to peptonized foods.) The Hquid pepsin of the med- 3 icine chest nay be employed to jelly milk in the same way as rennet (see RENNET and JUNKET).