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Hair Conditioning

POLYQUATERNIUM-55

CAS 306769-73-3
70

Safety score · 0–100

Fine

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

A cationic conditioning polymer used to soften hair and reduce static. Generally safe in rinse-off use; like other polyquats it can mildly irritate eyes if not rinsed properly.

Function

HAIR FIXING

Skin benefits

  • Hair-conditioning film former
  • Reduces static and frizz
  • Improves comb-through

Known concerns

  • Quaternary polymer — mild eye irritation
  • Synthetic polymer — biodegradation slow
  • Limited stand-alone safety publications

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.