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• Formula: C7H6O2
• Molar Mass: 122.12 g/mol
• Melting Point: 122.3 °c
• Boiling Point: 249.2 °C
• Density: 1.27 g/cm³

As a preservative in cosmetic formulations, it is primarily an anti-fungal agent that prevents fungi from developing in products and formulas and changing their composition. It is less effective against bacteria.Benzoic acid is an aromatic acid used in a wide variety of cosmetics as a pH adjuster and preservative. Benzoic acid has a long history of use as an antifungal agent in topical therapeutic preparations. It has been concluded that benzoic acid can be used safely at concentrations up to 5%, but that consideration should be given the nonimmunologic phenomena when using this ingredient in cosmetic formulations designed for infants and children.