Yes, barley contains gluten. The specific gluten protein in barley is called hordein, and it triggers the same type of immune response as wheat gluten in people with celiac disease or non-celiac gluten sensitivity. Barley is one of the three primary gluten-containing grains, alongside wheat and rye.
How Barley Gluten Differs From Wheat Gluten
Wheat gets most of the attention in gluten conversations, but barley’s gluten proteins are just as problematic. While wheat contains a gluten protein called gliadin, barley contains hordein. Both belong to the same family of storage proteins and provoke a similar inflammatory reaction in the small intestine of someone with celiac disease.
Interestingly, barley may actually trigger a broader immune response than wheat in some cases. Research published in the Journal of Autoimmunity found that eating barley activated immune cells that could cross-react with proteins in oats, something that didn’t happen after eating wheat or rye. This means barley consumption could potentially make some celiac patients more sensitive to oats as well.
Where Barley Hides in Processed Foods
Whole barley and pearl barley are easy to spot on an ingredient list. The trickier problem is barley-derived ingredients that show up under less obvious names. The most common culprit is malt. Unless a label specifies otherwise, malt is almost always made from barley. That includes malt syrup, malt extract, malted milk, and malt vinegar. Soy sauce also typically contains wheat and sometimes barley, making most conventional soy sauces off-limits on a gluten-free diet.
Modified food starch is another ingredient worth checking. While it’s often made from corn or potato, it can occasionally be derived from barley or wheat. The Academy of Nutrition and Dietetics lists it among processed ingredients that may contain hidden gluten. If a product doesn’t specify the source of its modified food starch, contacting the manufacturer is the safest route.
Barley in Beer and Spirits
Most conventional beer is brewed from barley and contains significant levels of gluten. “Gluten-removed” beers use enzymes to break down gluten proteins, but current testing methods can’t reliably confirm whether all harmful fragments have been eliminated. These are not the same as true gluten-free beers, which are brewed from naturally gluten-free grains like sorghum or rice.
Distilled spirits are a different story. Whiskey, scotch, and other spirits made from barley go through distillation, a process that separates alcohol vapor from the liquid and leaves proteins behind. The U.S. Alcohol and Tobacco Tax and Trade Bureau now permits “gluten-free” labeling on spirits distilled from gluten-containing grains, provided good manufacturing practices are followed and the final product tests free of protein fragments. The Celiac Disease Foundation has endorsed this ruling. So pure, unflavored distilled spirits are generally safe, but flavored varieties may have barley-based ingredients added after distillation.
What the FDA Rules Say About Barley
Under FDA regulations, any food labeled “gluten-free” must contain less than 20 parts per million (ppm) of gluten. This is the lowest threshold that can be reliably measured with validated testing methods, and it’s the same standard used internationally. The rule also explicitly prohibits gluten-free labeling on foods that contain wheat, rye, or barley, or ingredients derived from those grains, unless the ingredient has been processed to remove gluten and the final product falls below 20 ppm.
One nuance worth knowing: barley enzymes used in food manufacturing have tested at less than 5 ppm of gluten in past analyses, which falls well below the FDA threshold. However, products like Marmite, a yeast extract made from spent brewer’s yeast, have tested at around 30 ppm, putting them above the gluten-free cutoff.
Gluten-Free Alternatives to Barley
If you love barley’s chewy texture in soups, stews, and grain bowls, several gluten-free grains can fill that role. Sorghum is one of the closest matches, with a similar chewiness and a mild, nutty flavor that works well as a base for pilafs or as a substitute for couscous. Steel-cut oats (labeled gluten-free to avoid cross-contamination) also deliver a hearty, chewy texture, though they cook up softer than barley. Buckwheat groats and millet are other options that hold their shape in slow-cooked dishes.
For recipes that call for barley flour, sorghum flour or a blend of rice flour and tapioca starch can approximate the mild flavor and binding quality. No single flour perfectly replicates barley’s properties, so blends tend to give better results than a one-to-one swap.