Sodium benzoate is an advanced preservative that must be added to some packaged foods, sodas, and personal care products for extending its shelf life. This is a preservative that must be included in the beverages and processed foods for improving their shelf life. Sodium benzoate is a crystalline and odorless powder that can be made by the combination of sodium hydroxide and benzoic acid. This is a good preservative on its own and allows for simple dissolving. This is a man-made compound as well as an essential food preservative.