Potassium Sorbate (Cosmetic) vs Sodium Benzoate (Cosmetic): which is worse?

What is Potassium Sorbate (Cosmetic)?

Potassium sorbate is the potassium salt of sorbic acid, a naturally occurring compound found in rowan berries. It is an antifungal and antiyeast preservative used in cosmetics, food, and personal care 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

Potassium Sorbate (Cosmetic): Potassium sorbate is one of the least allergenic preservatives used in cosmetics. The CIR and EU SCCS have confirmed its safety at permitted concentrations (≤0.6% in EU cosmetics, as sorbic acid equivalent). It is non-mutagenic, non-carcinogenic, and not an endocrine disruptor. Mild skin sensitization is possible but uncommon. It is widely accepted in natural and organic cosmetics certifications.

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.