I'm with you @liuzhou. Our government allows a lot of leeway for big food business, which has them firmly in their pocket. Government does make concessions for people with life threatening allergies, and so God and Big Ag alone know what else is in that "garlic extract" besides soy, which of course, should NOT be there. Soy is a recognized allergen here. You just about cannot eat out in this country unless you are not really allergy prone, do a whole bunch of detailed research, or stick to mom and pop like places with proprietors and service people who actually know what they are cooking with. I guarantee you if you tell a minimum wage Taco Bell employee that you are allergic to X and ask if it is in an offering they have, they won't know.
You won't be any happier reading what's in their seasoned ground beef that they use to fill tacos, burritos, etc. I read somewhere it's only 80% beef. From the Taco Bell website and linked upthread:
I still get cravings for Taco Bell. I know it is crap, but when I don't feel like cooking and have little money, they still get my business at times. I'm not allergic to any food ingredients, and for that I am very thankful. If I went into anaphylaxis in reaction to a food ingredient as some people do, I would have to eat at home 100% of the time. As much as I love cooking, that might compromise my sanity, such as it is.