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Hair Conditioning

POLYQUATERNIUM-105

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 in the polyquaternium family — same safety profile as polyquaternium-106 and 107. Mild and effective in hair care with the usual rinse-off caveats.

Function

HAIR CONDITIONING

Skin benefits

  • Smooths and conditions hair
  • Reduces static and frizz
  • Improves wet/dry combability
  • Mild on most users

Known concerns

  • Cationic — eye irritation in poorly formulated rinse-off
  • Quaternary polymers don't fully biodegrade
  • Thin direct safety review for this number

References

EU

EU CosIng database

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

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Check your shelf

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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.