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Theaflavins are reddish-colored powdery polyphenols in black tea made from the leaves of Camellia sinensis. During the fermentation process used in the preparation of black tea, theaflavins are formed from oxidative condensation of selective pairs of two catechins by polyphenol oxidase.

Theaflavins are known as anti-oxidation compounds, furthermore, have some effects, anti-tumor, anti-obesity, and antibacterial activity. It is not only taken in supplement form as capsules or tablets, but also widely used in drinks, jellies and candies, and so on. And, theaflavins have a powerful antibacterial activity, therefore, is formulated into various processed products such as nonwoven fabrics, mouthwash and cosmetics.