Sodium Bisulfite
Reviewed by Rosie · Last updated 18 Aug 2026
Used in acid-type permanent waves to alter hair shape | Less damaging than alkaline permanent waves
At a glance
EWG Safety Score
What Is Sodium Bisulfite?
Used in acid-type permanent waves to alter the shape of hair. It is less damaging than alkaline permanent waves, but also has limitations regarding how much change it can effect in hair. It can be a skin sensitizer.
Benefits for Your Skin
How widely it's used
Regulatory information
Standardised cosmetic-ingredient identifiers used by regulators.
Show identifiers
- INCI Name
- SODIUM BISULFITE
- INN Name
- sodium bisulfite
- EC Number
- 231-548-0
- Function
- Antioxidant, Preservative, Redu CI Ng
From the Clinic
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