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Quick answer: Alpha-isomethyl ionone carries the heavier risk profile. Alpha-isomethyl ionone is warning label required in the EU and allowed in the US; Hydroxyisohexyl 3-cyclohexene carboxaldehyde is banned in the EU and allowed in the US.
| Property | Alpha-isomethyl ionone | Hydroxyisohexyl 3-cyclohexene carboxaldehyde |
|---|---|---|
| EU status | Warning label required | Banned |
| US status | Allowed | Allowed |
| Risk level | low | medium |
| Banned in | — | European Union |
| Restricted in | European Union | — |
| Category | fragrance | fragrance |
| Where it hides | perfume, scented products | perfume, deodorant, lotion |
Alpha-isomethyl ionone (Alpha-Isomethyl Ionone) is a fragrance allergen.
Hydroxyisohexyl 3-cyclohexene carboxaldehyde (Hydroxyisohexyl 3-Cyclohexene Carboxaldehyde) is a fragrance allergen (Lyral).
Alpha-isomethyl ionone: An EU-listed fragrance allergen requiring declaration.
Hydroxyisohexyl 3-cyclohexene carboxaldehyde: A strong fragrance allergen; banned in EU cosmetics since 2021.
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