What? Any of a group of water-soluble colloidal carbohydrates of high molecular weight found in ripe fruits, such as apples, plums, and grapefruit, and used to jell various foods, drugs, and cosmetics. It is produced as a white to light brown powder, mainly extracted from citrus fruits, and is used in food as a gelling agent. Pectin is used as a thickening agent in cooking and baking. In manufacturing, pectin is an ingredient in some denture adhesives.
Why? Some people apply pectin to the skin to protect raw or ulcerated mouth and throat sores.