TRIMETHYL-4-NONANONE
Safety score · 0–100
Fine
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
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 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 — always read the physical product label and consult a healthcare professional for personal concerns.