Ingredient profile
ALPHA-ISOMETHYLLONONE
Raters disagreeperfumingskin conditioningCAS 127-51-5
At least one of our safety lists speaks to this ingredient. Also written as alpha isomethyllonone, Alpha-Isomethyllonone.
Raters don't agree. Here's where each one stands
Safe
Greenlens Precautionary Screen
Independent
Greenlens Tolerance Screen
Independent
Caution
Greenlens Ingredient Scan
Independent
Concern
—
Where each list lands
Funding shown- Caution
Greenlens Ingredient Scan
Independent
An EU-regulated fragrance allergen that must be labelled; a common contact-sensitization trigger. (EU Cosmetics Regulation Annex III / Reg. (EU) 2023/1545 (labelled fragrance allergen))
- Safe
Greenlens Precautionary Screen
Independent
No listed hazard trait recognized for this ingredient.
- Safe
Also screened — not on these lists
- Health Canada Ingredient Hotlist
- California Proposition 65
- US NTP Report on Carcinogens
- IARC Monographs
- ANSES Endocrine Disruptors
- EU Microplastics Restriction
- EU Harmonised Classification (CLP Annex VI)
Where regulators stand
Shown side by side, never combinedEach jurisdiction is reported on its own terms, from its own official lists. Where they disagree, that disagreement is the finding. Absence from a list is never a safety claim.
European Union
RestrictedAllowed only under stated conditions or limits.
- European Commission · EU Cosmetics Regulation Annex III / Reg. (EU) 2023/1545 (labelled fragrance allergen)An EU-regulated fragrance allergen that must be labelled; a common contact-sensitization trigger.
Canada
No listing foundNot on the lists we hold for this jurisdiction. That is an absence of a listing, not a safety finding.
Checked: Health Canada Cosmetic Ingredient Hotlist.
California
No listing foundNot on the lists we hold for this jurisdiction. That is an absence of a listing, not a safety finding.
Notes
- EU-regulated fragrance allergen
