Straight answer: a typical barley-based lager runs somewhere between 5 and 20+ parts per million (ppm) of gluten by most lab tests, but wheat beers and some stouts have measured as high as 100 to 146 ppm. That is well above the 20 ppm ceiling the FDA and most other regulators use to define “gluten-free,” so regular beer is never gluten-free no matter how light or filtered it looks. Beers labeled “gluten-removed” use enzymes to break the gluten protein down, which lowers the ELISA test result but does not guarantee safety for coeliac disease.
What Actually Counts as Gluten-Free
In the US, the FDA gluten-free labeling rule (21 CFR 101.91) sets the bar at under 20 parts per million (ppm) of gluten, which works out to less than 20 milligrams of gluten per kilogram of food or drink. The same 20 ppm threshold is used by the Codex Alimentarius standard internationally, so it is the number most food and drink labels are built around, in the US, Canada and most of Europe.
The FDA picked 20 ppm because it is the lowest level that could be reliably detected with standard lab testing at the time the rule was written, not because it is a proven safe dose for people with coeliac disease. Some people with coeliac disease react to even trace amounts below that line, which is why doctors still tell coeliac patients to treat any beer brewed from barley, wheat or rye as unsafe regardless of what a label claims.
How Much Gluten Is Actually in Beer
Independent lab testing backs this up. A peer-reviewed gluten analysis of commercial beers using ELISA testing found lager beers ranging from under 3 up to 8.7 milligrams per liter, stouts running 9.0 to 15.2 mg/l, and wheat beers as high as 41.2 mg/l. A separate 2023 study in the journal Foods tested five regular “control” beers and found one cream ale at 146.3 mg/kg, more than seven times the gluten-free threshold, while a Mexican lager came in at just 9.0 mg/kg, below it. The spread is wide because grain bill, mash temperature, filtration and clarifying agents all affect how much gluten protein survives into the finished beer.
| Beer type (regular, barley-based) | Measured gluten range |
|---|---|
| Adjunct lager | 5.4 to 60.0 mg/kg |
| Standard lager / pale ale | <3.0 to 8.7 mg/l |
| Stout / porter | 9.0 to 15.2 mg/l |
| Strong lager | up to 55.9 mg/kg |
| Wheat beer / dunkelweizen | 10.6 to 98.2 mg/l |
| Cream ale (outlier sample) | 146.3 mg/kg |
For comparison, beers marketed as gluten-removed or “low gluten” in that same research typically tested between 2 and 15 mg/kg, under the 20 ppm line, and dedicated gluten-free beers brewed from sorghum, millet, rice or buckwheat, like the ones in our best gluten-free beers roundup, do not contain barley, wheat or rye gluten at all.
Why Beer Has Gluten in the First Place
Beer’s gluten comes straight from its main ingredient. Barley, and to a lesser extent wheat and rye used in some styles, is roughly 75 percent gluten protein by weight in the raw grain, split between prolamins and glutenins. During malting and mashing, enzymes break most of that protein down into smaller peptides and amino acids, and a large share of what is left gets removed with the spent grain and the hot and cold break during brewing.
What survives fermentation is a small fraction of the original protein, often described as roughly a thousandth of the level found in the raw malt, but a small fraction of a very large starting amount can still land well above 20 ppm in the finished pint. Wheat beers tend to test higher because wheat itself carries more gluten than barley and wheat beer recipes lean on a bigger proportion of it.
Gluten-Removed vs Naturally Gluten-Free
There are two different approaches on shelves, and they are not the same thing. Naturally gluten-free beers, like the ones reviewed in our Omission Lager review category, skip barley, wheat and rye entirely and use grains like sorghum or rice, or in Redbridge and Glutenberg’s case, other alternative grains. These never contained gluten to begin with.
Gluten-removed beers, like Omission or the enzyme-treated beers tested in the studies above, start with regular barley malt and add an enzyme (commonly Brewer’s Clarex) during brewing that breaks up the gluten protein enough to pass a standard ELISA test. That gets the number under 20 ppm on paper, and it is a reasonable option for people avoiding gluten by choice or with mild sensitivity, but it carries a real risk for coeliac disease specifically, which is why dietitians and coeliac support groups generally recommend sticking to naturally gluten-free brands. Our gluten-free beer gift guide sticks to the naturally gluten-free camp for exactly this reason.
FAQ
Is any regular beer actually gluten-free?
No. Every tested batch of barley, wheat or rye beer in published lab studies has landed well above the 20 ppm gluten-free threshold, with some samples over 100 ppm.
Is gluten-removed beer safe for coeliac disease?
The FDA says there is currently no reliable way to confirm this, since standard tests cannot fully detect broken-down gluten fragments. Naturally gluten-free beer is the safer choice for coeliac disease specifically.
Does a lighter or clearer beer have less gluten?
Not reliably. Filtration and clarification help lower gluten levels, but the studies above show wide swings even between beers of the same style, so appearance is not a useful guide.
Which beer style tends to have the least gluten?
Standard barley lagers tested lowest on average in the research above, while wheat beers and some stouts tested highest, though individual brands vary a lot.
More Beer Facts and Guides
- Best Gluten-Free Beers 2026: 6 Picks Ranked and Reviewed
- Gluten-Free Beer Gifts: 8 Ideas for the Coeliac Beer Lover
- Omission Lager Review: Is This Gluten-Removed Beer Actually Safe?
- Redbridge Review: The Gluten-Free Beer You Can Actually Find Anywhere
- Does Beer Cause Bloating? The Two Real Reasons Why
