Tannin is a substance found in plants, particularly in products like tea, wine, and certain fruits. It gives these items a bitter taste and can make them feel dry. Full definition
The tea is also steeping and the amount of tannins in the liquid is rising. (wellnessmama.com)
Witch Hazel is a natural astringent which may help dry our pores and reduce inflammation because of the high amount of tannins contained in it. (acnesupplementscritic.com)