Beauty ingredient · Fragrance ingredient
Alpha-isomethyl ionone
A fragrance substance that EU law requires to be named on cosmetic labels above 0.001% (leave-on) or 0.01% (rinse-off).
- Labeled fragrance allergen
- Expert review pending
Concern level
A minor or very limited concern, such as being an ultra-processing marker only. The concern level sets how many points alpha-isomethyl ionone costs on a product’s receipt.
What the evidence says
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EU-labeled fragrance allergenRegulatory
Must be named on EU cosmetic labels above 0.001% (leave-on) or 0.01% (rinse-off) because some people are allergic to it. [1][2]
Evidence tiers say how sure the evidence is, separately from how much it matters. About evidence tiers.
Rules around the world
| Where | Status | Details | Date | Source |
|---|---|---|---|---|
| European Union | Warning label required | Must be named on the label above 0.001% (leave-on) or 0.01% (rinse-off). | — | [2] |
“Banned” means explicitly prohibited or withdrawn after review; “not permitted” means never authorized there. We use each regulator’s own words.
Popular products that list alpha-isomethyl ionone
1 of the 17,000 most-scanned products in the US with a GoodSwap page list alpha-isomethyl ionone.
Names GoodSwap recognizes on labels (2)
- isomethyl ionone
- alpha isomethyl ionone
Sources
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Regulation (EC) No 1223/2009 of 30 November 2009 on cosmetic products
“cosmetic products shall not contain any of the following: (a) prohibited substances — prohibited substances listed in Annex II”
eur-lex.europa.eu
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“when their concentration exceeds 0,001 % in leave-on products and 0,01 % in rinse-off products.”
eur-lex.europa.eu