Sodium Benzoate

Benefits
AntifungalAntiseptic

What is Sodium Benzoate?

Sodium benzoate is the sodium salt of benzoic acid, a naturally occurring compound found in berries and other plants, though commonly produced synthetically for commercial use. In cosmetics, it belongs to the preservative category, typically incorporated at low levels in water-based formulations like lotions, shampoos, and cleansers. It functions by disrupting microbial cell membranes and enzyme activity, particularly effective against fungi, yeasts, and certain bacteria in acidic environments (pH below 5). This antimicrobial action maintains product stability, prevents spoilage, and extends shelf life without altering the formula's sensory profile. Additionally, it aids in masking off-odors and protecting packaging from corrosion, contributing to overall product integrity and user safety.

Comedogenic Rating 0/5 Low risk of clogging pores
EWG Safety Rating 1-3 View on EWG →
PubChem View on PubChem →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Fragrance ingredient
Contributes scent character and/or masks base odors, shaping the overall sensory experience of the formula (subject to allergen and IFRA considerations).
Preservative
Protects the product from microbial contamination during storage and use, helping maintain safety, stability, and shelf life.
Anticorrosive
Protects metal components and packaging by reducing corrosion, helping maintain product integrity and preventing discoloration or contamination from metal surfaces.
Masking
Reduces perception of unpleasant odors or tastes by neutralizing them or covering them with more acceptable sensory notes.

Benefits

Helps prevent fungal contamination in products.

Provides antiseptic protection against microbes.

Supports product stability by inhibiting bacterial growth.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Individuals using water-based skincare prone to spoilage.
Those with known sensitivity to benzoates.
People seeking stable, long-lasting cosmetic formulas.
People experiencing contact dermatitis from preservatives.
Users of pH-balanced products for gentle preservation.
Individuals with very reactive skin conditions.

Safety Notes

  • Regarded as safe for cosmetic use by regulatory bodies when applied as directed.
  • Typically low risk of irritation at standard concentrations.

Frequently Asked Questions about Sodium Benzoate

What is sodium benzoate used for in cosmetics?

It acts primarily as a preservative to protect against microbes, while also masking odors and preventing corrosion.

Is sodium benzoate safe for skin?

Yes, authoritative reviews deem it safe at typical low concentrations in rinse-off and leave-on products.

Can sodium benzoate cause irritation?

It has low irritation potential for most, though sensitive individuals may experience mild reactions.