Preservative Sodium Metabisulfite

Sodium metabisulfite is a white or slightly colored crystalline powder. It is an inorganic salt made from sulfur dioxide and sodium hydroxide. It is commonly used as a preservative and antioxidant.

Manufacturers add sodium metabisulfite to foods to prevent spoilage by inhibiting the growth of bacteria and molds. It also acts as an antioxidant, preventing browning and preserving color in foods like dried fruits, wines, and processed potatoes. It is frequently found in dips, dried fruits, and some processed seafood.

Sodium metabisulfite is generally recognized as safe (GRAS) by the FDA for use as a food additive. It can cause allergic reactions in some individuals, particularly those with asthma or sulfite sensitivity, leading to symptoms like hives, breathing difficulties, or digestive upset. JECFA has evaluated sodium metabisulfite and established an acceptable daily intake. While generally safe, high intakes can deplete thiamine (Vitamin B1).