Sodium Benzoate[1][3] ●
TL;DR. This ingredient is primarily a preservative, used to help control bacteria, yeast, and mold in water-containing formulas. It is most effective in acidic products such as cleansers, toners, gels, and creams.
What does Sodium Benzoate[1][3] do in a cosmetic formula?
This ingredient is primarily a preservative, used to help control bacteria, yeast, and mold in water-containing formulas. It is most effective in acidic products such as cleansers, toners, gels, and creams.
Is Sodium Benzoate[1][3] clean?
It is widely accepted in clean-beauty frameworks and has a low sensitization profile for most users, though it can sting around the eyes or on already reactive skin. Some formulators pay attention when pairing it with vitamin C, because heat, light, and metal ions can create trace benzene under specific conditions.
Is Sodium Benzoate[1][3] sustainable?
This material is generally readily biodegradable and is not expected to bioaccumulate. Commercial supply is commonly synthetic and often fossil-derived, although its low use level keeps the formula footprint modest.
Is Sodium Benzoate[1][3] COSMOS-approved?
It is permitted under COSMOS natural and organic standards as an approved preservative, within concentration and product-type limits. From a Green Chemistry view, it scores well for efficacy at low levels and biodegradability, with a sourcing caveat when made from nonrenewable feedstocks.
How does Sodium Benzoate[1][3] work chemically?
The molecule is a water-soluble aromatic carboxylate salt, and its antimicrobial activity increases as pH drops because more of it shifts into the neutral acid form that can enter microbial cells. Typical use is about 0.1% to 1.0%, with best performance below roughly pH 5.5 and frequent pairing with chelators or co-preservatives for broader protection.
Last updated 2026-05-13