Other
2-METHYL-4-(2,6,6-TRIMETHYL-2-CYCLOHEXENYL)-3-BUTENAL
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A terpenic aldehyde fragrance compound structurally related to ionones, it is classified as a skin sensitiser and aquatic hazard and must be labelled with the warning 'May cause an allergic skin reaction'.
This trimethylcyclohexenyl butenal is a fragrance ingredient belonging to the terpenic aldehyde family, related to ionone derivatives. The EU mandatory warning H317 (may cause an allergic skin reaction) and H411 (toxic to aquatic life with long-lasting effects) apply. It appears on the list of fragrance allergens that must be declared in the ingredients list when present above 0.001% in leave-on or 0.01% in rinse-off products under EU Regulation 1223/2009.
Known concerns
- H317: May cause an allergic skin reaction (fragrance allergen)
- H411: Toxic to aquatic life with long-lasting effects
- Fragrance allergen — declarable in INCI at threshold concentrations
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
Related others
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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.