Preservation
Sodium benzoate
Its antimicrobial contribution depends strongly on finished-product pH because the undissociated acid is the more active form.
- INCI
- SODIUM BENZOATE
- CAS
- 532-32-1
- Also known as
- benzoic acid sodium salt · E211
- Function
- Preservation
Ingredient answer
What is Sodium benzoate?
Sodium benzoate is the water-soluble sodium salt of benzoic acid used in acidic cosmetic preservation systems.
Formulation behavior
How it works inside a formula
Design around the validated pH window, complementary preservation, solubility, packaging, and challenge testing rather than relying on nominal addition.
Where it appears
Common product contexts
- water-based serums
- lotions and creams
- cleansers
Practical caution
What to keep in view
A preservative name alone does not establish protection; validate the full system with appropriate challenge testing.
Take the ingredient into a working formula.
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