While rye and barley are not part of FALCPA* like wheat is, they're usually listed as such so they're easy to identify. Malt, malt extract, malt vinegar, and brewers yeast, however, as derivatives of rye and barley can be a little more tricky to spot. All derivatives of wheat will be clearly indicated in accordance with FDA regulations. *Food Allergy Labeling and Consumer Protection Act of 2004