Legal status:

In 2017, the European Commission suspended authorization for its use in animal feed across the European Union.

Today, ethoxyquin has been banned in the U.K. and by members of the European Economic Area, including Norway, Iceland and Liechtenstein. But ethoxyquin, within limits, is still permitted in animal feed in Australia, Japan, South Korea and the U.S.

According to Wikipedia, in the US it can also be added to "chili powder, paprika, and ground chili", for direct human consumption.