Potassium Metabisulfite Added To Enhance Freshness

Potassium metabisulfite is a white or slightly yellowish crystalline powder. It is a salt of sulfurous acid, formed by reacting potassium hydroxide with sulfur dioxide. It is often used as a preservative and antioxidant in food products.

Manufacturers add potassium metabisulfite to foods to prevent spoilage and maintain freshness. It works by inhibiting the growth of bacteria and fungi and by preventing oxidation. It is commonly found in dried fruits, wines, fruit juices, and processed vegetables.

In the U.S., potassium metabisulfite is generally recognized as safe (GRAS) by the FDA when used according to good manufacturing practices. It can cause allergic-type reactions in sensitive individuals, particularly those with asthma. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) and the European Food Safety Authority (EFSA) have evaluated potassium metabisulfite and established acceptable intake levels.