My diet:

Brewer's yeast

No E-numberFlavor enhancersOrigin: Fermented
Get a personal answer

Pick your family’s diets in the bar above.

Every diet

VeganYes

The ingredient is yeast. Hop residues do not make it an animal product.

Gluten-freeDepends

Beer yeast grown on barley can carry gluten. Only a gluten-free brand has shown otherwise.

HalalDepends

It is a by-product of beer. Certifiers do not all accept that.

KosherDepends

Beer-derived yeast needs certification.

KetoYes

The powder is used by the spoon, as protein.

Low-FODMAPDepends

A beer by-product can bother a sensitive gut even when the alcohol is gone.

The short answer
Brewer's yeast is yeast left over from making beer. It is bitter, it may contain barley gluten, and it is not the cheesy flake called nutritional yeast.
Use in moderation

Safe in small amounts; may bother some people or raise blood sugar.

E-numberNone
Comes fromFermented
What it doesFlavor enhancers
Glycemic index—
Daily limitNot set
Also calledBrewer's yeast, Brewers yeast

Rules by country

🇺🇸 US FDANot evaluated as an additive
🇪🇺 European UnionNot evaluated as an additive
🇨🇦 Health CanadaNot evaluated as an additive
CaliforniaNo extra rules

Brewer's yeast is a food ingredient, not an E-number. It is not nutritional yeast, which is grown specifically for the flakes, and it is not baker's yeast, which is sold alive to raise dough. Because the usual medium is barley malt, a gluten-free claim has to be earned by the brand, not assumed.

Daily limit: Experts haven’t set a number because normal food amounts are far below any level of concern.

What is it?

The powder is yellow-brown and sharply bitter. Supplement tablets and some savory spreads use it. Bakers do not, because the cells are spent.

Where it comes from: Brewer's yeast is Saccharomyces cerevisiae harvested after a beer fermentation. It is bitter because it carries hop compounds, and it can carry gluten from the barley malt the beer was made of. Debittered powders exist. They are still a beer by-product unless the label says otherwise.

Why it’s in food

  • Fills a B-vitamin supplement
  • Adds a bitter savory note
  • Fortifies a veggie burger
  • Feeds a nutritional claim on a powder

Often found in

Supplement tabletsSavory spreadsSome veggie burgersSeasoning blendsSmoothies that expect the bitternessFortified foods

Also listed as: Brewer's yeast, Brewers yeast, Saccharomyces cerevisiae from beer

Health & gut impact

Gluten can come alongConcern

The yeast itself has no gluten. The barley wort it fermented can leave gluten in the harvested paste.

Brewing practice and barley malt

Bitter on purposeUnder study

Hop compounds stick to the yeast. Debittered versions are washed. Unwashed powder tastes like beer.

Processing of spent brewer's yeast

What can I use instead?

Nutritional yeast

Ratio: Use the flakes when you want cheese, not beer

Best for: A gluten-free savory sprinkle

Yeast extract

Ratio: A little goes further

Best for: Broth flavor

Related

More flavor enhancers:

Artificial flavors (Artificial flavoring)Artificial flavor means the aroma was synthesized, not extracted from the food it tastes like. The category is allowed. Vegan, halal and kosher status still depends on the carrier.Use in moderationDiacetyl (Butanedione)Diacetyl is the buttery flavor molecule. The FDA lists it as a GRAS flavor. Breathing the vapor at work has harmed lungs. Eating the trace in a food is the exposure the GRAS rule is about.Use in moderationDisodium Guanylate E627Disodium guanylate (E627) is a savory booster used with MSG. It's usually made from yeast, but can come from fish, so check for a vegan label.Generally safeDisodium Inosinate E631Disodium inosinate (E631) boosts savory flavor, usually alongside MSG. It's often made by fermentation but can come from meat or fish, so it's only reliably vegan when labeled.Generally safe

Common questions

Is brewer's yeast gluten-free?

Not by default. It usually comes from barley beer. Buy it only when the package says gluten-free.

Is it the same as nutritional yeast?

No. Nutritional yeast is grown for food and tastes cheesy. Brewer's yeast is a beer leftover and tastes bitter.

Is Brewer's yeast safe?

Use in moderation (74/100). Brewer's yeast is a food ingredient, not an E-number. It is not nutritional yeast, which is grown specifically for the flakes, and it is not baker's yeast, which is sold alive to raise dough. Because the usual medium is barley malt, a gluten-free claim has to be earned by the brand, not assumed.

Is Brewer's yeast vegan?

Yes. The ingredient is yeast. Hop residues do not make it an animal product.

Is Brewer's yeast gluten-free?

Depends. Beer yeast grown on barley can carry gluten. Only a gluten-free brand has shown otherwise.

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Scientific sources & regulatory citations
  • Brewing practice and barley malt
  • Processing of spent brewer's yeast