Freshness Preserved With Sodium Metabisulfite

Sodium metabisulfite is a white or slightly colored crystalline powder. It is a salt of sulfurous acid, made by reacting sulfur dioxide with sodium carbonate or sodium hydroxide. It is commonly used as a preservative and antioxidant.

Sodium metabisulfite is added to foods to prevent spoilage by inhibiting the growth of bacteria and yeast. It also acts as an antioxidant, preventing browning and preserving the color of foods. It is often found in dried fruits, processed potatoes, and some wines.

In the US, sodium metabisulfite is generally recognized as safe (GRAS) by the FDA when used according to good manufacturing practices. It can cause allergic reactions in some individuals, particularly those with asthma. The Joint FAO/WHO Expert Committee on Food Additives (JECFA) has evaluated sodium metabisulfite and established an acceptable daily intake. Evidence regarding its effects at typical intake levels is mixed, with some studies suggesting potential benefits and others raising concerns.