(-)-Epigallocatechin is a polyphenol, which occurs naturally in various plants, including green tea leaves. The compound was shown to have anti-cancer activity in vitro, with breast cancer, lung cancer, and colon cancer cells. The commercial preparation of Polyphenon E contains about 3% (-)-epigallocatechin as an impurity.

2,4,5-trihydroxybutyrophenone is an antioxidant, especially for fats and oils. Potential food packaging migration residue. 2,4,5-trihydroxybutyrophenone is on the FDA Code of Federal Regulations Title 21 list.