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Antioxidant

SODIUM METABISULFITE

CAS 7681-57-4 / 7757-74-6 Updated
55

Safety score · 0–100

Moderate

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

About

A sulfite preservative/antioxidant used in hair dyes and self-tanners. Effective but a known asthma and contact-allergy trigger for sulfite-sensitive users.

Function

ANTIOXIDANTPRESERVATIVEREDUCING

Skin benefits

  • Antioxidant
  • Preservative-booster

Known concerns

  • Sulfite allergy/asthma trigger
  • Releases SO2
  • Skin sensitizer

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 — always read the physical product label and consult a healthcare professional for personal concerns.