Skip to content

5,9-DIMETHYL-8-DECEN-3-OL

CAS 19550-54-0
65

Safety score · 0–100

Fine

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

An unsaturated secondary alcohol fragrance with a complex floral-citrus character used at low concentrations in fine fragrances.

5,9-Dimethyl-8-decen-3-ol is a branched unsaturated C10 secondary alcohol with double bond at position 8 and methyl substituents at positions 5 and 9. The structure gives it a complex odor profile combining floral, citrus, and green notes. The secondary alcohol is less reactive than aldehydes, reducing sensitization concerns, though the unsaturation introduces stability considerations similar to other terpene alcohols. The compound has no EU restrictions and is considered safe at typical fragrance use levels.

Skin benefits

  • Complex floral-citrus fragrance
  • Good substantivity
  • Used in fine fragrance compositions

Known concerns

  • Unsaturation - potential oxidation products
  • Limited specific safety data
  • Minor environmental concern for aquatic organisms

References

EU

EU CosIng database

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

Check your shelf

Find 5,9-DIMETHYL-8-DECEN-3-OL in your products.

Scan any cosmetic product with LuxSense to see if it contains 5,9-DIMETHYL-8-DECEN-3-OL and get a full ingredient breakdown with safety scores.

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.