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Fragrance

TRANS-2-UNDECENAL

CAS 53448-07-0
50

Safety score · 0–100

Moderate

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

Trans-2-undecenal — a long-chain unsaturated aldehyde used in fragrance. Like other alpha,beta-unsaturated aldehydes it is a likely sensitizer; used only at trace.

Skin benefits

  • Citrus-fatty aldehyde fragrance

Known concerns

  • Alpha,beta-unsaturated aldehyde — reactive electrophile
  • Likely skin sensitizer (RIFM class)
  • Used at very low %
  • Limited public safety data

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.