A Preservative And Potassium Metabisulfite

Potassium metabisulfite is a preservative that is a white or yellowish crystalline powder. It is a salt of sulfurous acid, made by reacting potassium hydroxide with sulfur dioxide. It is often used in food processing to prevent spoilage and maintain color.

Manufacturers add potassium metabisulfite to foods and beverages as a preservative and antioxidant. It helps prevent the growth of bacteria and mold, and it can also prevent browning in fruits and vegetables. It is commonly found in dried fruits, wines, and some processed foods.

Potassium metabisulfite is permitted for use as a food additive by the FDA. It is generally recognized as safe (GRAS) when used according to good manufacturing practices. Some individuals, particularly those with asthma, may be sensitive to sulfites and experience allergic-type reactions. JECFA and EFSA have evaluated sulfites, including potassium metabisulfite, and established acceptable daily intakes.