Sodium Benzoate is a salt of benzoic acid (an acid commonly found in foods like cranberries, prunes, and cinnamon) that is used as an antimicrobial in acidic foods like fruit juices, jams, and relishes. Potassium sorbate is a salt of sorbic acid that is used in foods like cheeses, bread, sausages, and others to protect against yeast and molds.