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9-UNDECENAL.

Questionable CAS 143-14-6 / PERFUMING

An unsaturated fatty aldehyde primarily utilized as a fragrance component that delivers clean, aldehydic scents with ozone-like and citrus characteristics. This potent aromatic compound functions exclusively as a perfuming agent in cosmetic formulations, contributing to the sensory experience rather than providing therapeutic skin benefits.

perfuming

Science

Functions as an olfactory stimulant by binding to scent receptors to create distinctive fragrance profiles. May interact with skin proteins through Schiff base formation, a chemical reaction pathway that can potentially lead to sensitization in susceptible individuals.


Research

Medium confidence
Effective range 0.001–1%
Optimal

0.01%

Key findings

  1. 01 Effective concentration range for delivering organoleptic properties in consumer products

Transparency

Not commonly dusted

As a fragrance ingredient with known sensitization potential, dusting would be inappropriate and counterproductive


The Formula

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Exhibits high oxidation sensitivity requiring stabilization with 0.1% antioxidants such as Tinogard or alpha-tocopherol. Requires light-protected storage with nitrogen-purged headspace to maintain stability.

Conflicts

  • Strong oxidizing agents
  • Strong bases
  • Strong reducing agents

Safety

CIR Status
Not reviewed
Max tested
1%
Sensitization risk High

Classified as GHS Skin Irritant Category 2 and Skin Sensitizer Category 1, with allergic reactions reported in 20.8% of cases. Oral LD50 in rats documented at 5010 mg/kg.


Your Skin

Yes Normal
Yes Dry
Yes Oily
No Sensitive
Irritancy Moderate
Comedogenicity Unknown

Our Assessment

Questionable

While effective as a fragrance component, the high sensitization risk and moderate irritancy make it unsuitable for precision skincare formulations focused on skin health optimization.


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