Sodium Benzoate[1][2][4] ●
TL;DR. This ingredient is primarily a preservative, used to control bacteria, yeast, and mold in water-containing formulas. It is most effective in acidic products such as shampoos, cleansers, toners, and creams.
What does Sodium Benzoate[1][2][4] do in a cosmetic formula?
This ingredient is primarily a preservative, used to control bacteria, yeast, and mold in water-containing formulas. It is most effective in acidic products such as shampoos, cleansers, toners, and creams.
Is Sodium Benzoate[1][2][4] clean?
From a clean-beauty perspective, it is broadly accepted and not a common restricted-list concern. It is generally well tolerated, though like many preservatives it can contribute to stinging or irritation in sensitive skin at higher levels or in low-pH formulas.
Is Sodium Benzoate[1][2][4] sustainable?
This material is commonly made through conventional chemical synthesis, often from petrochemical feedstocks, though the chemistry is simple and efficient. It is readily biodegradable and is not considered persistent or bioaccumulative in typical cosmetic use.
Is Sodium Benzoate[1][2][4] COSMOS-approved?
It is permitted under COSMOS as an allowed nature-identical preservative for natural and organic cosmetics. Its Green Chemistry profile is supported by effective low-dose use, water compatibility, and biodegradability, with the main limitation being non-renewable sourcing in many supply chains.
How does Sodium Benzoate[1][2][4] work chemically?
The molecule is a small, water-soluble aromatic carboxylate salt whose preservative performance depends on conversion to its protonated acid form. It is typically used around 0.1% to 0.5%, performs best below about pH 5.5, and is often paired with other preservation boosters or chelators for broader system coverage.
Last updated 2026-05-13