INCI · preservative · CIR review pending · used in 32 products
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Sodium Benzoate
Sodium Benzoate (CAS #532-32-1) is a cosmetic preservative that works primarily against fungi. It is pH-dependent, functioning best at acidic pH levels between 3 and 5. Because it is not sufficiently effective on its own, it is always combined with other preservatives, commonly potassium sorbate. It also carries anticorrosive and masking functions according to CosIng.
Evidence level
strongEWG score
—Comedogenic
—Category
preservative● Benefits
Sodium Benzoate helps extend the shelf life of cosmetic products by inhibiting fungal growth. Its preservative action is most effective in acidic formulations (pH 3–5).
preservative
● Cautions
Works best only at acidic pH (3–5) and is not effective as a standalone preservative; must be combined with other preservatives such as potassium sorbate.
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