Sodium Benzoate And Sodium Bisulfite Added As Preservatives

Sodium benzoate is a salt of benzoic acid, a chemical that occurs naturally in some fruits and spices. It is typically manufactured by reacting sodium hydroxide with benzoic acid. Sodium bisulfite is a salt of sulfurous acid, a chemical that can be produced from sulfur dioxide.

These are added to foods as preservatives to prevent spoilage from bacteria, yeasts, and molds. They are often found together in acidic foods like pickles, olives, and relishes, where they work together to extend shelf life.

Sodium benzoate and sodium bisulfite are permitted food additives in the US. The FDA lists them as GRAS (Generally Recognized As Safe) when used according to good manufacturing practices. JECFA and EFSA have also evaluated these substances. While generally considered safe at typical levels, some people may be sensitive to sulfites, experiencing allergic-type reactions. Concerns have been raised about sodium benzoate's potential to form benzene in the presence of vitamin C, though levels are generally very low.