Tannic acid wani nau'in sinadari ne na kwayoyin halitta, musamman nau'in polyphenol, wanda ake samu a cikin tsirrai daban-daban kamar shayi, kofi, inabi, da bawon itacen oak. Yana da alaƙa da ɗanɗanonsa na astringent da ikon ɗaure da haɓaka sunadaran sunadaran. Ana amfani da tanic acid sau da yawa wajen samar da fata, da kuma yin tawada, rini, da tannins. A cikin magani, ana amfani da tannic acid a wasu lokuta azaman maganin astringent kuma a matsayin magani ga wasu nau'ikan yanayin fata.