tannins

Tannins are naturally occurring compounds found in many plants, including grapes, tea leaves, and oak bark. They are a type of polyphenol that contributes to the taste, color, and mouthfeel of foods and beverages like wine and tea. Tannins have the ability to bind with proteins and other organic molecules, giving a dry, astringent sensation in the mouth. They also have antioxidant properties, which can be beneficial for health. While they add complex flavors, excessive tannins can cause a bitter or astringent taste, so they are carefully managed in food and drink production.