Most commercial varieties on the market have the basics: dehydrated onions, onion powder, a LOT of salt and sodium, some sugar, and then several flavor additives and sometimes fillers, event things like caramel color or corn syrup. While some do not list gluten-containing ingredients, they generally cannot be relied upon to be gluten-free. Many state that they contain ingredients like milk products, corn starch, and/or monosodium glutamate - all of which can be problematic for those with certain food allergies.