Gallnut contains the highest naturally occurring level of tannin, from 50%~75%. Beside, it consists of gallic acid, ellagic acid, glucose, starch, cellulose, xylogen, gum, and resin.

Now, gallnut’s chemicals are widely used in Pharmaceuticals, food, feed additives, petroleum drilling, dyestuff, metallurgy, and so on. In modern industries, as a very useful natural raw material, gallnut is more and more important for its ecological significance.