Barley is not gluten-free and cannot safely substitute for gluten-free grains. It contains a family of storage proteins called hordeins, which belong to the same group of proteins found in wheat and rye. These proteins trigger the same immune response in people with celiac disease, and barley must be avoided entirely on a gluten-free diet. The good news: several grains closely mimic barley’s chewy texture and work well in soups, stews, and side dishes.
Why Barley Contains Gluten
Gluten is a collective name for the storage proteins in wheat, barley, and rye. In wheat, those proteins are called gliadin and glutenin. In barley, the equivalent is hordein, which makes up the bulk of the grain’s storage protein. Hordein contains the same proline- and glutamine-rich peptide sequences that provoke an immune reaction in celiac disease, affecting roughly 1% of the population. Research published in the International Journal of Experimental Pathology found cross-reactivity between wheat gluten-sensitive immune cells and barley hordein, meaning the body treats them as the same threat. There is no form of whole or pearled barley that is safe for someone avoiding gluten.
Barley Ingredients That Catch People Off Guard
Barley hides in ingredient lists under names that don’t always scream “gluten.” Malt extract, malt syrup, and malt flavoring are all derived from barley, and the FDA does not permit any of them in foods labeled gluten-free. Even if a finished product tests below the 20 parts per million (ppm) threshold used for other gluten-free claims, the FDA considers malt extract and malt syrup to be ingredients that have not been processed to remove gluten. They are categorically disqualified from gluten-free labeling.
This matters for everyday products like certain cereals, flavored rice mixes, energy bars, and salad dressings that use malt for color or sweetness. Malt vinegar, commonly served with fish and chips, is another one. If you see “malt” anywhere on a label without a gluten-free certification, assume it comes from barley.
Barley Grass
Barley grass is sometimes marketed as gluten-free because the young leaves of the plant, harvested before the grain develops, may not contain hordein. In practice, this is risky. If even a few early sprouts are present at harvest, the product will contain gluten. The tests used to measure gluten in barley grass can also over- or underestimate the true amount depending on the method. Most celiac disease experts consider barley grass an extremely high-risk ingredient and recommend avoiding it.
Beer, Spirits, and the Distillation Question
Traditional beer is brewed from barley malt and is not gluten-free. Because fermentation breaks proteins into fragments that standard gluten tests can’t reliably measure, the FDA requires manufacturers of fermented products bearing a gluten-free claim to document that all ingredients were gluten-free before fermentation and that no cross-contact occurred during production. In practice, this means beers brewed from sorghum, rice, or millet can carry a gluten-free label, but beers made from barley and then treated with enzymes to reduce gluten (sometimes labeled “crafted to remove gluten”) cannot.
Distilled spirits are a different story. Distillation removes all protein, including gluten, when good manufacturing practices are followed. The Alcohol and Tobacco Tax and Trade Bureau permits gluten-free claims on spirits distilled from barley or other gluten-containing grains, as long as no gluten-containing material is reintroduced after distillation. A straight bourbon or single malt whisky, for example, should contain no detectable gluten protein in the final distillate, though flavored spirits with added ingredients after distillation need closer scrutiny.
Best Gluten-Free Substitutes for Barley
What makes barley distinctive in cooking is its plump, chewy texture and mild, slightly nutty flavor. Not every gluten-free grain replicates that, but a few come close.
Sorghum is the closest match for barley in soups and stews. The whole grain holds its shape through long cooking times and stays chewy without going soggy. It benefits from an overnight soak before cooking, and even with over an hour of simmering it maintains a pleasant bite rather than turning mushy. Use it anywhere you would use pearled barley: beef and vegetable soup, mushroom stew, or grain salads.
Buckwheat groats (also called kasha when toasted) offer a heartier, earthier flavor. Despite the name, buckwheat is completely unrelated to wheat and contains no gluten. Nutritionally, it holds up well against barley. Boiled buckwheat groats contain roughly 16.5 g of total dietary fiber per 100 g, compared to about 8 g for boiled barley groats. Buckwheat is also notably high in B vitamins and antioxidant compounds like rutin and quercetin. The texture is softer than sorghum, so it works best in pilafs, porridges, and salads rather than long-simmered soups where it might break down.
Millet has a mild flavor that won’t compete with other ingredients. Cooked with extra liquid, it becomes creamy, almost like a risotto. Cooked with less liquid and fluffed, it stays separate and slightly fluffy. It won’t give you the same chew as barley, but it absorbs flavors beautifully in casseroles and stuffed peppers.
Teff is the smallest grain you’ll find and cooks in 15 to 20 minutes. It works well as a hot cereal or polenta-like side dish. You can also make an overnight porridge by soaking it in water in the refrigerator. Teff won’t substitute for barley in a chunky soup, but it fills the role nicely in breakfast bowls or as a creamy base under stews.
Quinoa rounds out the list as a versatile, protein-rich option. It cooks quickly and has a light, slightly springy texture. Rinse it thoroughly before cooking to remove the bitter natural coating on the seeds. When the pale outer hull begins to separate from the germ, it’s done. Quinoa works in cold grain salads, as a side dish, or stirred into soups in the last 15 minutes of cooking.
Cooking Tips for the Best Results
The biggest adjustment when switching from barley to a gluten-free grain is cooking time. Pearled barley typically needs 25 to 30 minutes, while sorghum can take 60 minutes or more, even with an overnight soak. Plan accordingly when building a soup or stew: start sorghum well before adding quick-cooking vegetables.
Liquid ratios also vary. Sorghum and buckwheat groats generally need about 3 cups of water per 1 cup of grain. Millet and quinoa are closer to a 2:1 ratio. Teff, because of its tiny size, absorbs liquid quickly and works at roughly 3 cups of water to 1 cup of grain for a porridge consistency, or 2 cups for a firmer side dish.
For soups specifically, sorghum is the standout. Its ability to hold texture through reheating makes it ideal for batch cooking. Buckwheat groats are better added near the end or cooked separately and stirred in, since they soften faster and can turn to mush if left simmering for an hour.