Ingredient · E220

Sulphur Dioxide Added

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Source
Unknown
Not yet classified by editors
Allergen
No
Role in food
Sulfur dioxide and sulfites are used as preservatives in many foods. They help prevent …

What it is

Sulfur dioxide (SO2) is a gas that occurs naturally in small amounts. It is often made by burning sulfur. In food, it is typically added as a salt, like sodium sulfite or potassium metabisulfite.

Why it's used

Sulfur dioxide and sulfites are used as preservatives in many foods. They help prevent spoilage by inhibiting the growth of bacteria, yeasts, and molds. They also act as antioxidants, preventing browning in dried fruits and vegetables, and can be used to keep wine from oxidizing.

Health notes

Sulfur dioxide and sulfites are generally recognized as safe (GRAS) by the FDA when used as preservatives. However, some people are sensitive to sulfites and may experience allergic-type reactions, such as asthma symptoms. The FDA requires foods containing more than 10 parts per million of sulfites to declare them on the label. JECFA and EFSA have evaluated sulfites and established acceptable daily intakes.

Allergen info

Not a major allergen.

Products containing Sulphur Dioxide Added

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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.