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5-NONEN-2-ONE

CAS 27039-84-5
50

Safety score · 0–100

Moderate

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

An unsaturated ketone with green-fruity fragrance characteristics and moderate sensitization potential subject to IFRA restrictions in the EU cosmetic market.

5-Nonen-2-one is an alpha,beta-unsaturated methyl ketone with green, fruity odor characteristics. It is subject to IFRA guidelines due to its unsaturated ketone structure. It is not specifically listed in EU cosmetic regulation Annexes II or III. The PubChem safety score of 50 indicates moderate concern primarily related to its sensitizing potential as an enone.

Known concerns

  • Skin sensitization (alpha,beta-unsaturated ketone, IFRA)
  • Moderate hazard profile

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.