Yeast extract and other words to look for in the ingredients list of ... If a food product regulated by the FDA is NOT labeled gluten-free, the food should be avoided if any of the following words are included in the ingredients list (or the Contains statement in the case of wheat): Wheat; Rye; Barley; Oats; Malt (Unless a gluten-free grain is named as the source, such as corn malt) Brewer's yeast