Sodium Sulfite

Sodium sulfite is a white crystalline powder. It is a salt of sulfurous acid, which is formed when sulfur dioxide dissolves in water. It is produced industrially by reacting sulfur dioxide with a sodium base, such as sodium hydroxide or sodium carbonate.

Sodium sulfite acts as a preservative by preventing oxidation and inhibiting the growth of microorganisms. It is often used in dried fruits, wines, and processed potatoes to maintain color and freshness. It can also be found in some baked goods as a dough conditioner.

Sodium sulfite is generally recognized as safe (GRAS) by the FDA for use as an antioxidant and preservative. It is a common allergen for individuals with asthma, and high doses can cause allergic-type reactions in sensitive people. JECFA and EFSA have evaluated sodium sulfite and established acceptable daily intakes. Evidence on its long-term health effects at typical consumption levels is mixed, with some studies suggesting potential benefits and others raising concerns.