Standard beer made from barley contains anywhere from about 60 to over 25,000 parts per million (ppm) of gluten, depending on the style. For context, the threshold for a “gluten-free” label is below 20 ppm. Most conventional beers exceed that by a wide margin, though the range varies dramatically from one type to the next.
Gluten Levels by Beer Style
Not all beers carry the same gluten load. The differences come down to which grains are used and how much wheat or barley protein ends up in the final product. Average gluten concentrations across common styles break down like this:
- Lager: ~63 ppm
- Stout: ~361 ppm
- Ale: ~3,120 ppm
- Wheat beer: ~25,920 ppm
Wheat beers sit at the extreme end because they’re brewed with a high proportion of wheat, which is packed with gluten proteins. Lagers tend to be lowest because the brewing and filtration process strips out more protein, but 63 ppm is still triple the gluten-free cutoff. Even the “lightest” conventional beer is not safe for someone with celiac disease.
What About Specific Brands?
Independent testing of popular brands shows some surprising results. Budweiser (both the US and Czech versions) has tested as low as 5 ppm in some samples, which would technically fall below the 20 ppm gluten-free threshold. Heineken has shown variable results across tests, ranging from 5 to 40 ppm. Guinness has tested positive for gluten in multiple rounds of testing.
These numbers come with an important caveat: gluten in fermented drinks is notoriously difficult to measure accurately. The standard lab tests (called ELISA assays) were designed to detect intact gluten proteins, but fermentation and brewing break those proteins into smaller fragments. The most sensitive version of the test, called competitive R5 ELISA, catches more of these fragments than other methods, but no current test can fully quantify how much gluten-equivalent protein remains after fermentation. That’s why regulatory agencies won’t let brewers put a specific ppm number on beer made from barley or wheat, even if a lab test comes back low.
Gluten-Removed Beer: Lower but Not Zero
Some breweries use a specialized enzyme during brewing that chops gluten proteins into smaller pieces. This process can reduce measurable gluten from over 270 mg/L down to roughly 13 to 20 mg/L when the enzyme is added early in the brewing process. That’s a reduction of over 90%, and the resulting beer often tests below 20 ppm on standard assays.
The catch is that “below detection” doesn’t necessarily mean “safe for celiac.” Research using more advanced detection methods like mass spectrometry has found that enzyme-treated beers can still contain protein fragments that trigger immune responses in people with celiac disease. In lab studies, blood samples from celiac patients reacted to residual material in gluten-removed beer. Whether those fragments actually cause intestinal damage when you drink the beer is less clear. One study found that simulating normal digestion drastically reduced the immune-reactive fragments, suggesting the gut may break them down further. But that’s not the same as proof of safety, and no clinical trials have confirmed that gluten-removed beer is harmless for people with celiac.
How Labeling Rules Work
In the United States, the FDA and the Alcohol and Tobacco Tax and Trade Bureau (TTB) draw a sharp line between two categories. A beer can be labeled “gluten-free” only if it’s made from ingredients that never contained gluten in the first place, such as sorghum, rice, millet, or buckwheat, and tests below 20 ppm.
Beer brewed from barley or wheat and then treated with enzymes cannot be called “gluten-free,” regardless of what the lab results show. Instead, it can carry language like “processed to remove gluten,” but only if it also includes a mandatory disclaimer: the gluten content cannot be verified, and the product may contain gluten. This policy exists specifically because there is no scientifically validated way to measure how much intact-equivalent gluten remains in a fermented product. A test reading of 10 ppm on an enzyme-treated barley beer doesn’t carry the same certainty as 10 ppm on a rice-based beer.
Choosing Beer Based on Your Sensitivity
If you have celiac disease, the safest options are beers brewed entirely from gluten-free grains. Brands made from sorghum, rice, millet, or buckwheat that carry a “gluten-free” label meet the regulatory standard and avoid the measurement uncertainty that comes with fermented barley products. Many craft breweries now produce dedicated gluten-free lines using these grains.
If you have a milder gluten sensitivity rather than celiac, gluten-removed beers may be tolerable, but this is individual territory. Some people report no symptoms, while others react. The enzyme treatment does break down the primary toxic sequences in gluten, but fragments can remain. Lagers, with their lower baseline gluten, are also a somewhat better bet than ales or wheat beers if you’re trying to minimize exposure without going fully gluten-free.
Ciders and most distilled spirits are naturally gluten-free alternatives. Distillation removes gluten proteins, so plain vodka, rum, and tequila are generally safe, though flavored versions may add gluten-containing ingredients after distillation.