What is Ethoxyouin?

Ethoxyouin is a quinoline-based antioxidant used as a food preservative and a pesticide.  It is commonly used as a preservative in pet foods to prevent the rancidification of fats. [1]

There has been some speculation that ethoxyquin in pet foods might be responsible for certain health problems. To date, the US FDA has only found a verifiable connection between ethoxyquin and buildup of protoporphyrin IX in the liver, as well as elevations in liver-related enzymes in some animals. It has been shown to cause mortality in fish. [1]


"This A+ FRR Pet Nutrition FAQ discusses BHA, BHT, and Ethoxyquin, and reveals why these potentially toxic artificial preservatives are included in some pet food brands." [?]