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Fragrance ingredient

5-METHYL-ALPHA-IONONE

CAS 79-69-6
55

Safety score · 0–100

Moderate

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

5-methyl-alpha-ionone (alpha-isomethyl ionone) is a synthetic violet-floral fragrance. It is on the EU mandatory allergen labeling list and can cause sensitization in fragrance-reactive users.

Skin benefits

  • Provides violet/floral fragrance note
  • Widely used in perfumery

Known concerns

  • Known fragrance allergen on EU 26 declarable list (as alpha-isomethyl ionone)
  • Potential skin sensitizer
  • May aggravate fragrance-sensitive skin
  • Environmental persistence concerns

References

EU

EU CosIng database

European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.

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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve, so always read the physical product label and consult a healthcare professional for personal concerns.