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Quick answer: Limonene carries the heavier risk profile. Limonene 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 | Limonene | 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 | cleansers, perfume, household-crossover cosmetics | perfume, deodorant, lotion |
Limonene (Limonene) is a citrus fragrance allergen.
Hydroxyisohexyl 3-cyclohexene carboxaldehyde (Hydroxyisohexyl 3-Cyclohexene Carboxaldehyde) is a fragrance allergen (Lyral).
Limonene: An EU-listed fragrance allergen; oxidized limonene is a sensitizer.
Hydroxyisohexyl 3-cyclohexene carboxaldehyde: A strong fragrance allergen; banned in EU cosmetics since 2021.
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