Benzyl Alcohol (Preservative) vs Sodium Benzoate (Cosmetic): which is worse?

What is Benzyl Alcohol (Preservative)?

Benzyl alcohol is an aromatic alcohol used in cosmetics both as a preservative (antimicrobial) and as a solvent and fragrance ingredient. As a preservative it is commonly used in combination with sodium dehydroacetate (forming the 'Geogard' system) in natural-certified products.

What is Sodium Benzoate (Cosmetic)?

Sodium benzoate is the sodium salt of benzoic acid, used as a broad-spectrum antimicrobial preservative in cosmetics, personal care products, and food. In cosmetics it is most effective at acidic pH (<5.5), where it converts to the active benzoic acid form.

Documented risks

Benzyl Alcohol (Preservative): Benzyl alcohol is permitted in EU cosmetics as a preservative at ≤1% and as a fragrance ingredient (it is also one of the 26 EU fragrance allergens requiring labeling). The CIR has confirmed safety. It can cause allergic contact dermatitis in sensitized individuals. In some countries (France, EU), its use in cosmetics for infants under 3 years is advised against due to potential neurotoxicity concerns in neonates. At cosmetic concentrations for adults, it is well-tolerated and not carcinogenic.

Sodium Benzoate (Cosmetic): Sodium benzoate is considered safe for cosmetic use by the CIR and EU SCCS at regulated concentrations (≤2.5% in EU cosmetics). It is a weak sensitizer and can cause urticaria (hives) in some sensitive individuals. At low cosmetic concentrations, systemic risk is negligible — it is rapidly metabolized and excreted. The concern about sodium benzoate + ascorbic acid forming benzene is food-specific and not relevant to most cosmetic applications.