Sodium Benzoate
Well-tolerated
INCI · Sodium BenzoateCAS 532-32-1
Also known as: Benzoic acid sodium salt
Preservative
In plain language
The sodium salt of benzoic acid, used primarily to stop bacterial growth in acidic formulas (pH under 5.5).
A standard, safe food-grade preservative often paired with potassium sorbate in natural cosmetics.
Can potentially react with pure Vitamin C (ascorbic acid) under very specific conditions to form trace amounts of benzene, though rare in modern cosmetics.
Where it can be sold
Simplified regulatory status by market — for guidance, not compliance advice.
European UnionRestricted
Max 2.5% in rinse-off, 0.5% in leave-on.