Chapter 8: Fragrance · Part 1: The listed fragrance allergens
Alpha-isomethyl ionone
- Officially classed skin allergen
The worst fact: it was in over 1 in 5 scented products tested in Europe, and Australia classes it as "May cause an allergic skin reaction".
Why brands use it: a floral, violet-like note.
Take care if: you have a fragrance allergy.
Comes from: made in a factory, by joining citral with methyl ethyl ketone and then closing it into a ring.
Myth check: nil.
Contaminants: nil.
Fair to say: it's one of the less frequently reported allergens.
Correct as of November 2026. What the badges mean
Sources
- Safe Work Australia. Hazardous Chemical Information System (HCIS). hcis.safeworkaustralia.gov.au
The full source list is at the end of Chapter 8.