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Hair Conditioning

BIS-GLYOXYLOYL CYSTINE

70

Safety score · 0–100

Fine

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

A cystine derivative with reactive glyoxyloyl groups, used as a hair bond-builder. Promising for repair products; the reactive aldehyde chemistry warrants caution at high levels.

Function

HAIR WAVING OR STRAIGHTENING

Skin benefits

  • Hair bond-rebuilder via cystine disulfide chemistry
  • Reduces breakage in chemically processed hair
  • Targeted active for hair repair

Known concerns

  • Reactive aldehyde-functional group (glyoxyloyl)
  • Limited published safety dossier
  • Niche bond-building active

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.