What it is
Benzoic acid is a simple aromatic acid that, along with its salts, is widely used to protect cosmetics from microbial spoilage. It is most effective in slightly acidic formulas, where it acts against yeasts, molds, and some bacteria. In sunscreens it serves to keep the product preserved rather than to provide UV protection.
Safety & warnings
Benzoic acid is a well-established cosmetic preservative used within established concentration limits. It can be mildly irritating to skin and mucous membranes at higher levels, but is generally well tolerated at the low concentrations used for preservation.
Origin & sourcing
Occurs naturally in some plants and resins and is also produced synthetically for commercial use.
Questions everyone asks
What is benzoic acid's role in cosmetics?
It is mainly a preservative that helps protect the product from microbial growth, working best in slightly acidic formulas.
Is benzoic acid natural?
It occurs naturally in some plants and resins, but the material used in cosmetics is commonly produced synthetically.