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INCI ingredient

Alpha-isomethyl Ionone

Also listed as: Alpha-isomethyl Iononë

A violet-scented fragrance allergen that EU labels must declare by name.

What it triggers

  • Vegan originYesno animal source
  • FragranceYescounts as fragrance
  • ParabenNonot a preservative of this family
  • SulfateNonot a sulfate surfactant
  • SiliconeNonot a silicone
  • AlcoholNonot a drying alcohol

If a product lists Alpha-isomethyl Ionone, its fragrance-free answer is No. Nothing else changes.

What it does

Alpha-isomethyl ionone is a synthetic scent molecule with a soft violet and woody note, used in a large share of perfume blends. CosIng lists it as perfuming. EU rules make brands print it on the label once it passes a set concentration.

Seeing it on a list means the product is scented, so the fragrance-free answer is no.

Functions: fragrance, declared allergen

Products with Alpha-isomethyl Ionone

in 1,071 products

Showing 24 of 1,071 products with this ingredient, most scanned first.

In the EU ingredient database

Functions listed by CosIng
  • skin conditioning
  • perfuming
  • skin conditioning: Maintaining the skin in good condition.
  • perfuming: Used for perfume and aromatic raw materials.

CAS 127-51-5 · EC 204-846-3

EU regulation

Listed in Annex III (ref. 90) of the EU Cosmetics Regulation. III/90

CosIng records a perfuming function for this ingredient.

Source: CosIng, European Commission. Informative, no legal value; the regulation text is the reference.

Fragrance-free instead

Classification from the INCI name; product lists from Open Beauty Facts.Report a mistake