Potassium Metabisulfite

Potassium metabisulfite, listed as food additive E224, is a chemical compound used as a preservative and antioxidant in the food industry. It releases sulfur dioxide, which inhibits the growth of microorganisms and prevents oxidation, thereby extending the shelf life of food products. It is most commonly used in winemaking, brewing, dried fruit production, fruit juices, and pickled goods. Home cooks may encounter it when making homemade wines or preserves. People with a sulfite allergy should avoid it, as it can trigger allergic reactions or asthma symptoms. Its use in the EU is regulated, with strictly defined maximum permitted levels in food products.