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Antioxidant

SODIUM SULFITE

CAS 7757-83-7
50

Safety score · 0–100

Moderate

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

Sodium sulfite — a reducing agent used in hair-perming, depilatories and as a preservative. Effective but a known allergen and respiratory irritant for sulfite-sensitive people.

Function

ANTIOXIDANTHAIR WAVING OR STRAIGHTENINGREDUCING

Skin benefits

  • Reducing/antioxidant in oxidative hair products
  • Stabiliser against discoloration
  • Used in perm-neutralizers and depilatories

Known concerns

  • Sulfite allergen in sensitive individuals
  • Releases SO2 — respiratory irritant
  • Not for asthmatics
  • Skin sensitiser

References

EU

EU CosIng database

European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.

PC

PubChem

U.S. NIH compound data, GHS hazard codes and toxicity literature.

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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve, so always read the physical product label and consult a healthcare professional for personal concerns.