Chinese gall nut, also known as Chinese sumac gall or Rhus chinensis gall, is a type of gall that is formed on the Chinese sumac tree (Rhus chinensis) in response to the infestation of a tiny insect called the Chinese gall wasp (Aphelinus gossypii). The gall is a round, hard, woody structure that is usually about the size of a pea, although larger galls can also occur.

Chinese gall nut has been used in traditional Chinese medicine for centuries due to its various health benefits. It is believed to have anti-inflammatory, antioxidant, and anticancer properties, and has been used to treat a range of conditions, including diarrhea, dysentery, hemorrhoids, and skin disorders. Chinese gall nut is also used in the production of ink and dyes, as well as in the tanning of leather.

The chemical composition of Chinese gall nut includes tannins, gallic acid, ellagic acid, and flavonoids, which are responsible for its medicinal properties. Chinese gall nut extract is available in various forms, including powder, capsules, and liquid, and is used as an ingredient in many health supplements and herbal remedies.

While Chinese gall nut is generally considered safe for consumption, it may cause adverse effects in some individuals, particularly those who are allergic to tannins. It is always recommended to consult with a healthcare professional before using any herbal supplement or remedy.