My diet:

Oyster sauce

No E-numberFlavor enhancersOrigin: Animal
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Pick your family’s diets in the bar above.

Every diet

VeganNo

Oyster sauce is oyster extract.

Gluten-freeDepends

Many bottles thicken with wheat or add soy sauce. Gluten-free ones are labeled.

HalalNo

Oysters are not accepted as halal seafood under the scales-and-fins rule.

KosherNo

Shellfish is not kosher.

KetoDepends

Standard oyster sauce is sweetened. A sugar-free brand is the exception.

Low-FODMAPDepends

Garlic, wheat or a large sweet pour can push it over a low-FODMAP line.

The short answer
Oyster sauce is a sweet, salty extract of oysters. It is not vegan, not kosher and not halal. It is gluten-free only when the bottle says so. It is not a free pour on keto, because sugar is part of the usual formula.
Use in moderation

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

E-numberNone
Comes fromAnimal
What it doesFlavor enhancers
Glycemic index—
Daily limitNot set
Also calledOyster sauce, Oyster flavored sauce

Rules by country

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

Oyster sauce is a food, not an E-number. Oysters are shellfish, so the sauce is not kosher and is not accepted as halal under the rules that allow only fish with scales. Gluten depends on the thickener and the soy sauce.

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

What is it?

Cooks simmer oysters in water until the liquid is brown, then concentrate it. Factories add caramel color, sugar and a starch so the sauce pours the same every time. The vegetarian version on the next shelf is soy and mushroom.

Where it comes from: Oyster sauce is oyster extract cooked down with brine, then thickened and sweetened. Most supermarket bottles also add sugar, cornstarch and often wheat flour or soy sauce. A vegetarian oyster sauce is mushroom seasoning and is a different product.

Why it’s in food

  • Glazes stir-fried greens
  • Colors a noodle
  • Finishes beef
  • Sweetens a marinade

Often found in

Bok choyChow meinBeef and broccoliMarinadesFried riceLettuce wraps

Also listed as: Oyster sauce, Oyster flavored sauce

Health & gut impact

ShellfishConcern

The sauce is an oyster extract. A shellfish allergy and a kosher or halal kitchen both treat it as off-limits, not as a minor seasoning.

Identity of oyster sauce

Sugar in the bottleConcern

The classic supermarket sauce is sweetened. A keto recipe that uses it by the quarter cup is counting that sugar.

Typical ingredient lines of oyster sauce

What can I use instead?

Soy sauce

Ratio: A plant seasoning without shellfish, still often with wheat

Best for: Stir-fries

Fish sauce

Ratio: A different seafood seasoning, salty rather than sweet

Best for: Southeast Asian cooking

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 moderationBrewer's yeastBrewer'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 moderationCalcium inosinate E633Calcium inosinate (E633) is a savory flavor booster related to disodium inosinate, used alongside MSG in snacks and stock products. It is gluten-free, but vegan, halal and kosher status depends on whether it was made by fermentation or from animal tissue.Generally safeDiacetyl (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 moderation

Common questions

Is oyster sauce vegetarian?

The real sauce is not. Products labeled vegetarian oyster sauce are mushroom sauces using the same idea.

Is oyster sauce gluten-free?

Often no, because of wheat flour or soy sauce. A gluten-free bottle says so.

Is Oyster sauce safe?

Use in moderation (62/100). Oyster sauce is a food, not an E-number. Oysters are shellfish, so the sauce is not kosher and is not accepted as halal under the rules that allow only fish with scales. Gluten depends on the thickener and the soy sauce.

Is Oyster sauce vegan?

No. Oyster sauce is oyster extract.

Is Oyster sauce gluten-free?

Depends. Many bottles thicken with wheat or add soy sauce. Gluten-free ones are labeled.

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Scientific sources & regulatory citations
  • Identity of oyster sauce
  • Typical ingredient lines of oyster sauce