HealthyPIG Magazine

Tannins are present in the gallnuts formed by insects on the branches of certain oak trees. Purified tannic acid is sometimes used as a medicine. People use tannins to treat cold sores, diaper rash, heat rash, and many other conditions, but there is no good scientific evidence to support these uses. In food and beverages, tannins are used as flavorings. In the manufacturing process, tannins are used in ointments and suppositories; in tanning hides and making inks; and to kill dust mites on furniture.