I can't find any information of the decay cycle of Ethoxyquin (nor the molecule of it so I could see if I can figure out what it's doing), but I can say that the very vast majority of pesticides and herbicides used these days decay away in the soil from the actions of water, heat, oxygen, and bacteria.

This is actually an anti-oxidant, not a pesticide/herbicide/fungicide. Biochemically, I'll take a shot in the dark and guess that it oxidizes easily to absorb free oxygen before it damages the food. Once all of it has oxidized, it's ineffective (at that, at least) unless it can somehow de-oxidize, which I doubt it can without a lot of high-energy input.

The alfalfa meal I used was gerbil food. I didn't check the preservatives, but I'll lay bets on it having the same thing. No harm done on my end. Most of us probably used the same stuff in our alfalfa (and other products) on our lawns.

Thank you for the reply morpheuspa, I'll give it a whirl!