Sodium Metabisulfite E223

Sodium metabisulfite is a white or slightly yellowish crystalline powder. It is a salt of sulfurous acid, produced industrially by treating sodium carbonate or sodium hydroxide with sulfur dioxide. It is often used as a source of sulfur dioxide.

Sodium metabisulfite is primarily used as a preservative and antioxidant in foods. It helps prevent spoilage by inhibiting the growth of bacteria and fungi, and it can also prevent browning in dried fruits and vegetables. It is commonly found in dried fruits, wine, and some processed foods like jams and jellies.

Sodium 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 sodium metabisulfite. While generally considered safe, some studies have explored its potential effects, but evidence is mixed regarding significant health concerns at typical dietary levels.