Report

Is alcohol-free beer vegan?

By Alex Stewart

Published 3 November 2026. Every figure links to its source below. How these pages are made.

Quick answerUsually, but not always. Beer is made from water, malted grain, hops and yeast, all plant or fungal. Two things can make it not vegan: isinglass, a fish-based clearing agent used in many cask ales, and added animal ingredients such as lactose or honey. Lactose must be declared as milk on the label. Isinglass does not have to be, so look for a vegan mark or ask the brewer.

Why some beers are not vegan

Vegan Friendly UK explains that isinglass is a collagen made from the dried swim bladder of fish, and many cask ales still use it to clear the beer. Other styles add animal ingredients directly: lactose (milk sugar) in milkshake IPAs and some stouts, or honey.

The labelling gap

UK food law lists 14 allergens that must be declared, including fish and milk. But the fish entry carries a specific exemption:

fish gelatine or Isinglass used as fining agent in beer and wine

So a beer cleared with isinglass does not have to say "fish" on the label. Lactose has no such exemption: it counts as milk, so it must appear in the ingredients. In practice:

Ingredient	Animal source	Must it be on the label?
Isinglass (fining)	Fish swim bladder	No, it is exempt from the fish allergen rule
Lactose	Milk	Yes, declared as milk

Alcohol-free beer follows the same rules, so the label alone will not prove a beer is vegan. Look for a vegan mark, or check the brewer's website.

Where IMPOSSIBREW fits

IMPOSSIBREW, which publishes this site, lists its Enhanced Lager as vegan on the product page. Its Triple Hopped IPA contains lactose, so it is not vegan. For any other beer, check the label or the brewer.

FAQs

Is non-alcoholic beer vegan?

Most are, but some use fish-based isinglass to clear the beer or add lactose or honey. Check for a vegan mark.

Does isinglass have to be on the label?

No. UK food law exempts isinglass used as a fining agent in beer from the fish allergen labelling rule.

Is IMPOSSIBREW vegan?

The Enhanced Lager is listed as vegan. The Triple Hopped IPA contains lactose, so it is not.

Sources

All read 3 November 2026 unless stated.