Fragrance
FARNESAL
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
A sesquiterpene aldehyde — the aldehyde form of farnesol. The α,β-unsaturated aldehyde functionality places it in a sensitization-watched class.
Farnesal (CAS 19317-11-4) is the sesquiterpene aldehyde corresponding to farnesol (which is on the EU Annex III declarable fragrance allergen list). The α,β-unsaturated aldehyde functional group is a Michael acceptor with greater protein reactivity than the alcohol form, so farnesal carries a higher sensitization expectation than farnesol. Public CIR/SCCS monographs are limited; RIFM/IFRA manage use. Natural occurrence in some essential oils and as a metabolic intermediate to farnesol does not remove the reactive-aldehyde class concern. Default upper-yellow (68) reflects these structural considerations.
Function
Skin benefits
- Fresh-green woody note
- Sesquiterpene character
- Natural metabolic precursor
Known concerns
- α,β-unsaturated sesquiterpene aldehyde reactivity
- Sensitization class (related to farnesol which is an EU-declared allergen)
- Oxidation potential
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.