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Hair Conditioning

Hydroxypyridinone and its salts, when used as a substance in hair dye products

CAS 822-89-9
50

Safety score · 0–100

Moderate

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

A heterocyclic hair-dye intermediate restricted under EU Annex III. Permitted at strict concentrations but flagged for skin and respiratory sensitisation — patch testing is recommended before each use.

Skin benefits

  • Functions as a hair dye intermediate under EU Annex III restrictions

Known concerns

  • Skin and respiratory sensitisation potential
  • Requires strict purity and concentration controls
  • Permitted only in hair dye products, not for skin contact products

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.