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5-METHYL-ALPHA-IONONE.

Optional CAS 79-69-6 / PERFUMING

A synthetic fragrance molecule that delivers violet, woody, and floral notes while providing mild skin conditioning properties. This ionone isomer offers enhanced stability compared to natural essential oils, making it a reliable choice for fragrance formulations across multiple product categories.

perfuming skin conditioning

Science

Functions as an olfactory agent by binding to scent receptors to deliver its characteristic violet-woody fragrance profile, while simultaneously providing light emollient conditioning to enhance product sensory experience on skin.


Research

High confidence
Effective range 0.001–32%
Optimal

0.82%

Key findings

  1. 01 Patch testing at 5% concentration showed minimal irritant reactions, with concentrations ≤1% demonstrating excellent tolerance in non-sensitized individuals (Lalko et al., 2007)
  2. 02 Global fragrance usage analysis identified 0.82% as the 95th percentile concentration in hydroalcoholic products without systemic toxicity (RIFM, 2019)

Transparency

Not commonly dusted

As a fragrance ingredient with established IFRA guidelines and EU labeling requirements, this ingredient is well-regulated rather than commonly dusted in formulations.


The Formula

Solubility
Oil
Optimal pH 4 – 8
0 7 14

Stability

Demonstrates superior stability versus natural essential oils in standard cosmetic matrices; requires light protection during storage to prevent oxidative degradation

Conflicts

  • Strong oxidizing agents
  • Strongly alkaline environments (pH >8.0)

Safety

CIR Status
Safe as used
Max tested
32%
Sensitization risk Moderate

Classified as potential skin sensitizer under EU regulations; requires mandatory labeling at ≥0.001% in leave-on products; IFRA restricts to 32% maximum in Category 3 applications


Your Skin

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

Our Assessment

Optional

A well-tolerated fragrance ingredient that serves its intended purpose effectively, though offers minimal skincare benefits beyond sensory enhancement.


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