... .8%. Second: Has been exported to EU,Japan and USA for 6 years. Gallic acid is a trihydroxybenzoic acid, a type ... , witch hazel, tea leaves, oak bark, and other plants.The chemical formula is C6H2(OH)3COOH. Gallic acid is found both free ... in the pharmaceutical industry.It is used as a standard for determining the phenol content of various analytes by the Folin ...