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Fragrance aldehyde

CIS-4-DECENAL

CAS 21662-09-9
55

Safety score · 0–100

Moderate

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

A cis-configured C10 unsaturated aldehyde used as a green-fatty fragrance and flavour note. Like other unsaturated aldehydes, it carries an established sensitisation risk and is restricted by IFRA.

Skin benefits

  • Fatty aldehyde with green, fruity, fatty fragrance notes
  • Used in flavour and fragrance compositions at low levels

Known concerns

  • Unsaturated aldehydes are recognised skin sensitisers
  • IFRA restricts use levels in leave-on cosmetics
  • Can oxidise to more reactive species during storage
  • Not ideal for sensitive skin in leave-on products

References

EU

EU CosIng database

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

Related fragrance aldehydes

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DIMETHYL HEPTENAL
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ISOPROPYL-METHYL-BICYCLOOCTENE-2-CARBALDEHYDE
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3,5,6-TRIMETHYL-3-CYCLOHEXENE-1-CARBALDEHYDE
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3-ETHYL-3,7-DIMETHYLOCT-6-ENAL
Fragrance aldehyde
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AR-ETHYLPHENYLBUTYRALDEHYDE
Fragrance aldehyde
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3,7-DIMETHYL-3,6-OCTADIENAL
Fragrance aldehyde
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AR-ISOPROPYLPHENYLACETALDEHYDE
Fragrance aldehyde
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BUTYL CINNAMALDEHYDE
Fragrance aldehyde

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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.