Fragrance
trans-2-Heptenal, when used as a fragrance ingredient
Safety score · 0–100
Caution
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
An unsaturated aldehyde used at trace levels for green, fatty fragrance notes. Highly reactive (Michael acceptor) and one of the more potent fragrance sensitisers — strictly limited by IFRA and EU.
Skin benefits
- Provides a fatty, fresh-green fragrance note
Known concerns
- Potent skin sensitiser (alpha,beta-unsaturated aldehyde)
- Acutely irritating to skin and eyes
- EU Annex II/III restricted at very low limits
- IFRA Standard severe restriction
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related fragrances
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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.