Ingredient
Sodium Benzoate
Benzoic Acid Sodium Salt
What it is
The sodium salt of benzoic acid, a widely used preservative that inhibits mould, yeast and some bacteria in water-containing cosmetic formulas. It also contributes mild pH buffering.
How it works
In its undissociated acid form, favoured at lower formula pH, it crosses microbial cell membranes and disrupts internal pH and metabolism, inhibiting microbial growth.
What it does
Preservative
Buffering
Concerns to know
-
Well tolerated
No significant safety concern is reported for this ingredient as used in cosmetics.