Sodium Metabisulfite Sulfites

Sodium metabisulfite is a white or slightly yellowish crystalline powder. It is a salt of sulfurous acid, produced by reacting sodium carbonate or sodium hydroxide with sulfur dioxide. It is commonly used as a preservative and antioxidant in various food products.

Sodium metabisulfite acts as a preservative by inhibiting the growth of bacteria and preventing spoilage. It also functions as an antioxidant, protecting foods from browning and preserving their color and flavor. It is frequently found in dried fruits, wines, processed potatoes, and some seafood.

Sodium metabisulfite is generally recognized as safe (GRAS) by the FDA when used as a preservative. It can trigger allergic reactions, particularly asthma symptoms, in sensitive individuals, especially those with sulfite sensitivity. JECFA has evaluated sulfites and established an acceptable daily intake. While generally safe for most, high intakes can cause gastrointestinal upset.