Fragrance
TRIMETHYLUNDECENAL
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
A long-chain branched unsaturated aldehyde used for waxy-floral fragrance notes. Monitor use level in leave-on due to aldehyde sensitization class.
Trimethylundecenal (CAS 141-13-9) is a C11 branched unsaturated aldehyde used as a fragrance ingredient for waxy, floral, and aldehydic effects. Long-chain aldehydes are substantially less systemically reactive than short-chain dienals but still belong to the broader fragrance aldehyde sensitization class and are subject to RIFM/IFRA management. Public CIR/SCCS cosmetic monographs for this specific isomer are limited. Default-yellow placement reflects the sparse public record balanced against industry routine use at controlled percentages.
Function
Skin benefits
- Waxy floral fragrance note
- Substantivity
Known concerns
- Aldehyde sensitization class
- Limited public data
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, so always read the physical product label and consult a healthcare professional for personal concerns.