Is alpha-isomethyl ionone a common allergen?

Alpha-isomethyl ionone is a fragrance material on the EU allergen disclosure list with documented sensitization potential that is more common than many other listed fragrance allergens. Published safety assessments have graded it with moderate concern. People with fragrance sensitivities or a history of allergic reactions should check labels and may want to patch-test products containing it.

fragrance

Alpha-Isomethyl Ionone

Watch if sensitive·Strong evidence

Alpha-isomethyl ionone is a violet-scented fragrance material and one of the EU-listed allergens requiring label disclosure. Documented sensitization is more common with this ingredient than with many other listed fragrance allergens.

Worth knowing

EU-labelled fragrance allergen
Known contact sensitizer for some
Restricted in the EU

EU named-label disclosure required above 0.001% leave-on / 0.01% rinse-off.

Gentler alternatives

Linalool

Questions

Is alpha-isomethyl ionone a common allergen?: Alpha-isomethyl ionone is a fragrance material on the EU allergen disclosure list with documented sensitization potential that is more common than many other listed fragrance allergens. Published safety assessments have graded it with moderate concern. People with fragrance sensitivities or a history of allergic reactions should check labels and may want to patch-test products containing it.

Products with Alpha-Isomethyl Ionone

References

Cosmetic information for general education, not medical advice. A verdict is a reading of the published evidence, never a guarantee for your skin: any ingredient can irritate someone, so patch test new products and see a professional if you react. Concern is graded on cited evidence, never on hazard-score lists. See how we score.