Ethoxyquin is not always listed on an ingredients list even when it is in a particular pet food. It is used to preserve “by-products”; it is considered to be part of the by-product and as such many pet foods are not listing Ethoxyquin on the label. Ethoxyquin may also be used to preserve animal fat, and as the manufacturer did not add the Ethoxyquin they do not have to list it; however they will be aware if it is in the fat they used or not, and as such pet foods that list ingredients as Human Grade Ingredients, will not contain Ethoxyquin.
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What is Ethoxyquin?
Ethoxyquin is a chemical pesticide; in most countries it is not accepted to be used in human foods, in fact it is totally banned on some countries. It has been shown to cause death in fish, and has been speculated to be linked to health problems in cats and dogs, including liver problems, and cancer. Just what are the concerns?
In 1997 the United States Food and Drug Administration Center for Veterinary Medicine launched a study. The results were not published nor made public, however the study did result in a request that pet foods reduce the use of Ethoxyquin from 150 parts per million to 75 ppm. (source – Wikipedia) This is 300 times higher than the permitted residue in beef or pork to be consumed by humans.