2-NONYLCROTONALDEHYDE
Safety score · 0–100
Moderate
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
An unsaturated aldehyde with a fatty-citrus odor, used in fragrance compositions with limited toxicological data and potential skin sensitization concerns.
2-Nonylcrotonaldehyde is an unsaturated aldehyde functioning as a fragrance ingredient. The nonyl substituent provides increased lipophilicity compared to shorter-chain analogues. It is not listed in EU Annexes II or III, but unsaturated aldehydes in general present concerns for skin sensitization and potential to generate reactive oxygen species. The IFRA/Olffy committee has restricted several nonyl-substituted aldehydes, and this compound falls into a structural class with recognized fragrance allergen potential. Limited public toxicological data makes comprehensive risk assessment difficult.
Skin benefits
- Provides fatty, citrus-floral fragrance notes
Known concerns
- Potential skin sensitization from unsaturated aldehyde structure
- Limited toxicological data available
- Fragrance allergen concern requiring IFRA evaluation
- May react with skin proteins to form haptenated complexes
References
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 — always read the physical product label and consult a healthcare professional for personal concerns.