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TRIMETHYL-4-NONANONE

CAS 123-18-2
65

Safety score · 0–100

Fine

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

TRIMETHYL-4-NONANONE is a cosmetic ingredient used in product formulation. Exercise caution due to limited available safety data.

Trimethyl-4-nonanone (isobutyl heptyl ketone, 4-methyl-2,6-dimethyl-4-heptanone) is a branched-chain ketone fragrance ingredient. It contributes fresh, citrus, and slightly woody notes to fragrance compositions and is used in fine fragrances and scented cosmetics. It is classified as a fragrance material with a long history of use and is not subject to restriction under EU Regulation 1223/2009 beyond standard allergen declaration requirements.

Skin benefits

  • Provides fresh, citrus fragrance notes
  • Used as fragrance modifier in perfumes
  • Adds complexity to floral and citrus compositions

Known concerns

  • May require fragrance allergen declaration under EU rules
  • Mild skin irritation possible at high concentrations
  • Limited data on sensitization in human studies

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.