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9-DECENAL.

Optional CAS 39770-05-3 / PERFUMING

An unsaturated fatty aldehyde that serves as a fragrance ingredient, delivering citrus-aldehydic notes with green undertones. This aromatic compound functions purely as an olfactory agent without therapeutic skin benefits, commonly used to mask unpleasant odors or enhance product fragrance profiles.

Perfuming Olfactory masking

Science

Acts exclusively as an olfactory modifier through interaction with nasal receptors; provides no documented biological activity on skin cells or therapeutic mechanism of action.


Research

Medium confidence
Effective range 0.005–0.25%
Optimal

0.0027%

Key findings

  1. 01 RIFM safety assessment established 0.0027% as 95th percentile usage in fine fragrances with systemic exposure (0.12 μg/kg/day) well below toxicological concern threshold

Transparency

Not commonly dusted

As a fragrance ingredient with limited skin benefits, dusting would be unlikely and unnecessary.


The Formula

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

Demonstrates excellent stability in perfume bases but requires protection from oxidation, light, and heat; maintains sensory profile at concentrations up to 15%

Conflicts

  • Strong oxidizing agents
  • Strong bases
  • Strong acids
  • Primary amines

Safety

CIR Status
Not reviewed by CIR; evaluated by RIFM and IFRA
Max tested
0.25%
Sensitization risk Moderate

Classified as GHS Category 2 skin irritant in undiluted form; IFRA restricts usage to 0.01-0.25% in fine fragrance and 0.005-0.1% in body care products


Your Skin

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

Our Assessment

Optional

A functional fragrance ingredient that serves its olfactory purpose effectively but offers no skincare benefits and requires careful concentration control due to irritation potential.


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