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Hydrazine salt (CMR)

Phenylhydrazinium sulphate (2:1)

CAS 52033-74-6
2

Safety score · 0–100

Avoid

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

A toxic hydrazine salt that is a known carcinogen and mutagen. It is banned in EU cosmetics and is shown here purely so consumers can verify it is never present in a compliant product.

Skin benefits

  • No cosmetic benefit; included only for regulatory transparency
  • Used historically as a laboratory reagent, never as skincare

Known concerns

  • Phenylhydrazine and its salts are classified as Carc. 1B and Muta. 2 under EU CLP
  • Acute oral, dermal and inhalation toxicant with severe skin sensitization potential
  • Methaemoglobin-forming agent causing haemolytic anaemia
  • Prohibited in cosmetic products under EU Cosmetics Regulation Annex II

References

EU

EU CosIng database

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

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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.