What is gluten free beer made from? Naturally gluten free vs gluten reduced, explained

Gluten free beer is brewed from grains that contain no gluten, most commonly sorghum, millet, buckwheat, rice or corn. A second category, called gluten reduced beer, starts with barley but uses an enzyme to break the gluten proteins down during fermentation. The two are not the same thing, and if you have coeliac disease, the distinction matters.

UK law lets both wear the gluten free label as long as the finished beer tests below 20 parts per million of gluten. The label does not tell you which method got it there.

This is the long version: the grains in the glass, the enzyme that does the work, and what to look for if you actually need to know your beer is safe.

The grains: what naturally gluten free beer is actually made from

Naturally gluten free beer is brewed from grains that never contained gluten in the first place. The four most common are sorghum, millet, rice and buckwheat. Corn (maize) is increasingly used too, sometimes as a base, more often as an adjunct alongside other grains.

Sorghum is the dominant grain in gluten free brewing globally. It gives a cereal-sweet, slightly earthy beer; malted sorghum can take on citrus and fruit notes. Some drinkers pick up a faint metallic edge they call a “twang”, though plenty of finished beers show none of it.

Millet has a soft mouthfeel and a light, slightly sweet character. It is the closest of the gluten free grains to traditional wheat beer in feel, which is why it ends up in many of the best-reviewed alternative-grain pints.

Buckwheat (technically a seed, not a grain) is darker and nuttier. Brewers tend to blend it rather than use it alone. It works well in stouts, dark ales and as a complexity layer.

Rice gives a clean, crisp body. It is light enough that mainstream lagers have used it as an adjunct for decades; on its own or blended with millet, it makes some of the most familiar-tasting gluten free pints on a UK shelf.

Corn is increasingly used both as a primary base in some naturally gluten free beers and as a complementary grain in enzyme-treated ones. It is neutral in flavour and well-suited to lighter styles.

Of the 61 breweries currently in the freefrombeer directory, two are classified as naturally gluten free: Altgrain Brewery in Southend-on-Sea, which brews on a bill of millet, buckwheat and quinoa, and Green’s, whose alternative-grain range uses sorghum, brown rice, buckwheat and millet. Altgrain’s Random Pale Ale (5%) is the session-strength benchmark in this category. Green’s Tripel Ale (8.5%) is one of the very few strong Belgian-style gluten free beers on the UK market.

Explore the naturally gluten free beers in the directory →

What is gluten reduced beer? (And how is it different)

Gluten reduced beer is brewed the traditional way, with barley, and then treated with an enzyme that cuts the gluten proteins into fragments small enough to slip below the UK’s 20 ppm gluten free threshold.

The enzyme is almost always Brewers Clarex, a proline-specific endoprotease made by DSM-Firmenich and distributed in the UK by Murphy & Son. It was originally developed to stop beer hazing in the bottle. The gluten-cutting effect was a by-product of the same protein-cleaving action. Brewers add it in liquid form during fermentation, alongside the yeast. It cannot be tasted in the finished beer.

A finished gluten reduced beer is tested by R5 Competitive ELISA, the standard lab assay for hordein (the gluten protein in barley). Most enzyme-treated beers come in well under the 20 ppm legal threshold; many test under 10 ppm, some non-detectable. Because the base grain is still barley, UK allergen law requires the label to state “contains barley”. That declaration is your single most useful signal that a beer in front of you is enzyme-treated rather than naturally gluten free.

Most of the breweries currently in the freefrombeer directory use this approach, including Bellfield Brewery in Edinburgh, Bristol Beer Factory, Hambleton Brewery, Brass Castle, Triple Point and Brightside. The supermarket regulars in the category (Daura Damm, Peroni Gluten Free, the BrewDog gluten free range) all use a version of the same process on a barley base.

Bellfield’s Lawless Village IPA is the most-cited example of a craft beer that hits this brief at quality: brewed from barley with the enzyme, finished below 10 ppm, and an IPA that any drinker would order whether they needed it gluten free or not.

Is gluten free beer safe for coeliacs?

Short version: naturally gluten free beers are safe; certified gluten reduced beers are endorsed by the bodies that certify them; uncertified gluten reduced beers are not recommended for coeliacs by most coeliac organisations.

UK law allows any beer testing below 20 ppm of gluten to wear the gluten free label, whether the gluten was never there or whether an enzyme stripped it out. Coeliac UK names two categories on its alcohol guidance page: naturally gluten free and gluten removed. Both must hit the same 20 ppm threshold to qualify.

The scientific complication sits in the test. R5 ELISA, the lab standard, has documented difficulty detecting the smaller peptide fragments that survive enzyme hydrolysis. A beer can pass the test and still contain immunogenic fragments the assay does not pick up. This is why the National Celiac Association in the US, Beyond Celiac and several UK breweries advise against gluten reduced beer for coeliacs.

The Association of European Coeliac Societies position from November 2024 sits in the middle. Gluten free beers produced under existing guidelines remain safe for coeliacs, the AOECS says, and it recommends choosing beers that carry the AOECS Gluten-Free Trademark for verified safety. Coeliac UK takes a similar line on its own certification.

The practical rule for a coeliac drinker:

• Naturally gluten free (no barley in the brewery): safe.
• Coeliac UK or AOECS certified, even if enzyme-treated: endorsed by the certifying body.
• “Contains barley” on the label, no trademark: enzyme-treated, not certified, not recommended for coeliacs by most coeliac bodies.

Bellfield Brewery is the case that complicates the simple story. It brews on a low-gluten barley base with Brewers Clarex and additional naturally gluten free grains. It is also Coeliac UK certified, with UKAS-accredited lab testing routinely under 10 ppm. The founders are coeliacs themselves. Certified gluten reduced is a different category from uncertified gluten reduced; the trademark exists to mark that distinction.

If a beer carries no certification mark and the label says “contains barley”, and you are coeliac, the conservative call is the naturally gluten free shelf.

Does gluten free beer taste different?

Some of it, honestly, yes. Most of it, less than the reputation suggests.

Sorghum-based beers are the most distinctive. The cereal-sweet, slightly earthy character is real, and not every drinker likes it on the first sip. Millet-based beers are the closest to wheat beer: light body, soft mouthfeel, mild sweetness. Rice gives a clean, almost neutral base. Buckwheat goes darker and nuttier. Most gluten free beer is also a touch lighter in body than the equivalent barley pint, because barley produces more body-giving dextrins than the alternative grains.

That much is grain chemistry, and it has not changed in years. What has changed is the brewing.

The category in 2026 is not the category it was in 2016. Bellfield’s Lawless Village IPA holds its own on any craft shelf at the same retail price. Altgrain’s Random Pale Ale stands up on quality alone. The story that gluten free beer is automatically the lesser drink has not aged well.

How to choose the right gluten free beer

Two questions sort most of it.

Are you coeliac, or gluten intolerant?

If you are coeliac, start with naturally gluten free and treat certified gluten reduced as the second option. Look for the Coeliac UK or AOECS trademark on the label, or for a brewery that brews entirely outside the barley supply chain. If you are gluten intolerant but not coeliac, the enzyme-treated supermarket range (Daura Damm, Peroni Gluten Free, BrewDog’s gluten free releases) is broadly fine and gives you the widest choice by far.

What style do you actually want?

For lager, the supermarket gluten reduced range is well stocked. For an IPA at craft quality, Bellfield’s Lawless Village or one of the Birmingham Brewing Company releases is the obvious starting point. For a Belgian-style strong ale brewed without barley at all, Green’s Tripel is one of the only options on the UK market. For a session pale ale, Altgrain’s Random.

If you are coming to gluten free beer for the first time and you are nervous about the flavour shift, start with a rice or millet-led one. The transition is gentlest there.

Find UK gluten free beer by style, brewery, and grain type in the freefrombeer directory.