Antioxidant Sodium Metabisulphite

Sodium metabisulfite is a white or slightly yellowish crystalline powder. It is a salt of sulfurous acid, formed by combining sodium sulfite or sodium bisulfite with sulfur dioxide. It is manufactured industrially through a chemical process.

Sodium metabisulfite is used as a preservative and antioxidant in various food products. It helps prevent spoilage by inhibiting the growth of bacteria and fungi, and it also prevents browning in dried fruits and vegetables. It is commonly found in dried fruits, wine, canned goods, and processed potatoes.

In the United States, 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 some individuals, particularly those with asthma or sulfite sensitivity. Both JECFA and EFSA have evaluated sulfites, including sodium metabisulfite, and have established acceptable daily intakes. Evidence on the link between sulfites and asthma symptoms is mixed, with some studies showing a correlation and others not.