Gallic acid belongs to the phenolic acids, it is a component of tannins and of phenolic glycosides. Rich sources are, among others, tea, knot-grass. It is an antioxidant that protects against free radicals, reduces the risk of inflammation, and fungal infection. Probably has an effect on insulin metabolism. Part of the health-beneficial, creatine and pro-testosterone supplements, and often it is used as a fat burner.