Ingredient

Treated With Carbon Monoxide

Source
Not animal-derived
Allergen
No
Role in food
Manufacturers use carbon monoxide to artificially enhance the red color of fish and shellfish, …

What is Treated With Carbon Monoxide?

Carbon monoxide is a gas used to treat certain seafood, like fish and shellfish. It is passed through the food's packaging to change the color of the flesh, making it appear redder and fresher. This treatment does not affect the safety or nutritional value of the seafood.

Is Treated With Carbon Monoxide vegan?

Treated With Carbon Monoxide is not animal-derived. Products that contain it can still include other animal-derived ingredients, so check the full ingredient list.

Is Treated With Carbon Monoxide gluten-free?

It does not contain gluten.

Is Treated With Carbon Monoxide a major allergen?

Carbon monoxide is not an allergen and is not derived from any of the nine major allergens.

What is Treated With Carbon Monoxide used for?

Manufacturers use carbon monoxide to artificially enhance the red color of fish and shellfish, making them look fresher to consumers.

Is Treated With Carbon Monoxide safe?

The U.S. Food and Drug Administration (FDA) permits the use of carbon monoxide in the processing of seafood.

Why it's used

Manufacturers use carbon monoxide to artificially enhance the red color of fish and shellfish, making them look fresher to consumers. This is commonly seen in products like tuna steaks and other fresh or frozen fish fillets. The gas helps the flesh maintain a bright red color during storage and display.

Health notes

The U.S. Food and Drug Administration (FDA) permits the use of carbon monoxide in the processing of seafood. While the gas itself is toxic in high concentrations, the levels used in food processing are very low and are not considered a health risk. The gas dissipates quickly and does not remain in the food. International bodies like JECFA have also evaluated its use in food processing.

Allergen info

Carbon monoxide is not an allergen and is not derived from any of the nine major allergens. It does not contain gluten.

Foods that contain Treated With Carbon Monoxide

Compare products →

Auto-generated content. This description was generated automatically and is pending editorial review. Inaccuracies are possible. Found a mistake? Contact us.

Last updated: October 5, 2026

Note: This site presents label data from USDA FoodData Central for general information. It is not medical advice. Check the package label; formulations change.