Ingredient · E220

Sulfur Dioxide

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Source
Not animal-derived
Allergen
No
Role in food
Sulfur dioxide is added to foods to prevent spoilage by inhibiting the growth of …

What it is

Sulfur dioxide (SO2) is a gas that occurs naturally in small amounts. It is often produced industrially by burning sulfur. It is commonly used in food production as a preservative.

Why it's used

Sulfur dioxide is added to foods to prevent spoilage by inhibiting the growth of bacteria, yeasts, and molds. It also acts as an antioxidant, preserving the color and flavor of foods. It is frequently found in dried fruits, wines, and some processed vegetables.

Health notes

Sulfur dioxide is generally recognized as safe (GRAS) by the FDA when used as a preservative. It can cause allergic-type reactions in some individuals, particularly those with asthma. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has evaluated sulfur dioxide and set an acceptable daily intake. Evidence regarding its long-term health effects at typical consumption levels is mixed, with some studies suggesting potential adverse effects while others find no significant issues.

Allergen info

Sulfur dioxide is not derived from any of the nine FDA major allergens. It does not contain gluten.

Products containing Sulfur Dioxide

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Last updated: September 28, 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.