Mother Jones published an article that identifies the brands of veggie burgers that contain soy protein isolated with the chemical hexane. It cites a Cornucopia Institute study. Organic veggie burgers are not made with a process that uses hexane, which has been identified as a neurotoxin. Often times, the major brands of veggie burgers offer a non-organic veggie burger made with hexane as well as organic version that does not use hexane. It might be worth reading the links and checking your freezer.