What is Metabisulfite?

Metabisulfite is a chemical compound commonly used as a preservative and antioxidant in food and beverages. Its most common forms are sodium metabisulfite (Na₂S₂O₅) and potassium metabisulfite (K₂S₂O₅).

Uses of Metabisulfite

• As a food preservative to prevent spoilage and discoloration.
• In winemaking and brewing to inhibit unwanted microbial growth.
• For sanitizing equipment in the food and beverage industry.
• In laboratories as a reducing agent.

Safety and Precautions

Although metabisulfite is approved for use in food, it can cause allergic reactions, especially in people with asthma. Its use is regulated, and products containing it often carry warning labels.