Potassium sorbate is a salt of sorbic acid that is used in foods such as cheeses, bread, sausages, and others, to protect against yeast and molds. 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. Rosemary extracts are derived from rosemary and contain several compounds that can be considered to be antioxidative including the phenolic diterpenes carnosol and carnosic acid. Nisin preparation is a mixture that includes Nisin. Nisin is an antibacterial compound that is produced through fermentation processes with microbes. It can be used as a naturally sourced food preservative. Natamycin is an anti-fungal product that is produced via the fermentation process of soil bacteria Streptomyces natalensis. In food, natamycin is typically used to inhibit mold growth on cheeses.