Have you ever looked at the ingredients label on a package of flour tortillas? How about gluten-free flour tortillas? I don't honestly know if the long named items on the ingredient list are bad or not, but I certainly can't pronounce them. Corn tortillas have much fewer ingredients, but the store bought ones are pricey and a bit rubbery.
I buy Maseca Corn Flour at the grocery store in the Mexican Foods aisle. You know you have the right one if it has the instructions for making tortillas on the back of the bag. You don't want to use corn flour that is not made for tortillas so make sure those instructions are on there.