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Hair Conditioning

SILICONE QUATERNIUM-21

Updated
72

Safety score · 0–100

Fine

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

About

A cationic silicone used mainly in hair care to deposit a smooth conditioning film. Generally well tolerated; long-term build-up is the main caveat for cationic silicones.

Function

SKIN CONDITIONING - EMOLLIENTSURFACTANT - EMULSIFYING

Skin benefits

  • Hair conditioning film
  • Reduces frizz and static
  • Adds slip and softness
  • Substantive on skin

Known concerns

  • Cationic build-up possible
  • Limited public data on this specific quat

References

EU

EU CosIng database

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

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AVOCADAMIDOPROPYL DIMETHYLAMINE
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BABASSUAMIDOPROPYL DIMETHYLAMINE
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BEHENOYL PG-TRIMONIUM CHLORIDE
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BIS(C13-15 ALKOXY) PG-AMODIMETHICONE
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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.