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6-ETHYL-3-METHYLOCT-5-ENOL

CAS 26330-64-3
62

Safety score · 0–100

Fine

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

An unsaturated secondary alcohol fragrance ingredient with potential for skin oxidation and sensitization, requiring IFRA declaration in the EU.

6-Ethyl-3-methyloct-5-enol is an unsaturated terpene alcohol used as a fragrance ingredient imparting green, citrus, or floral notes. Like other unsaturated C8-C10 alcohols in fragrance compositions, it may undergo oxidation in air to form hydroperoxides and aldehydes that act as skin sensitizers. IFRA standards require antioxidant-stabilized formulations for this class. EU cosmetic labeling under Regulation 1223/2009 mandates declaration of fragrance allergens, and unsaturated terpenes fall under the IFRA declaration requirement at 0.01% in rinse-off products.

Known concerns

  • Unsaturated alcohol - oxidation products are skin sensitizers
  • Requires antioxidant stabilization in cosmetic formulations
  • IFRA declaration required at ≥0.01%

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.