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Other / Pharma Intermediate

trans-4-cyclohexyl-L-proline monohydrochloride

CAS 90657-55-9
50

Safety score · 0–100

Moderate

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

A cyclohexyl-modified proline hydrochloride used as a pharmaceutical intermediate, not a typical cosmetic ingredient. Limited safety data; conservative caution band.

Skin benefits

  • Modified proline used as pharmaceutical building block

Known concerns

  • Pharma intermediate; no established cosmetic role
  • No CIR/SCCS dossier identified
  • HCl salt may locally irritate at higher levels
  • Defaults to caution given absent cosmetic data

References

EU

EU CosIng database

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

Related other / pharma intermediates

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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.