Is beer vegan?
Last checked 30 August 2026
Worth checking.
Most beer is vegan — it is water, malted barley, hops and yeast. The exceptions are real ales fined with isinglass, milk stouts, and beers brewed with honey or lactose.
Why most beer is fine
Four ingredients: water, malted grain, hops, yeast. Nothing about that is animal-derived, and the vast majority of lager, IPA, wheat beer and canned or bottled craft beer is vegan without anyone having to try.
The three exceptions
Isinglass-fined cask ale. Isinglass is made from fish swim bladders and is the traditional way to clear British real ale. It is still used, particularly in cask conditioned beer served from a handpump. Most large breweries have moved away from it — Guinness famously did in 2018 — but plenty of smaller cask producers have not.
Milk stout and pastry stout. These contain lactose, a milk sugar, deliberately and by name. Lactose does not ferment, which is exactly why it is used: it stays sweet and thickens the body. It will be on the label, because it is an allergen.
Honey beers and some fruit beers. Honey shows up in some ales and braggots. A few fruit beers and lambics historically used gelatine for clarity, though this is now rare.
What does not matter
The finings question only arises for beer that needs clearing. Anything sold deliberately hazy — a New England IPA, a hefeweizen, most modern craft — has not been fined at all, because the haze is the point.
How to check quickly
The allergen line does most of the work. Contains: milk means lactose. Contains: fish means isinglass, and in the EU and UK it has to be declared. If neither appears and there is no honey in the ingredients, you are almost certainly fine.
Barnivore has catalogued thousands of specific beers, and for a cask ale in a pub, asking the bar staff whether it is fined is a normal question that they get regularly.