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Moumoujus

METHYL ALPHA-IONONE ISOMERS.

Avoid CAS 1335-46-2 / PERFUMING

Methyl alpha-ionone isomers are a group of synthetic aromatic compounds widely utilized in various consumer products for their distinct fragrance. In skincare, their primary function is to impart a pleasant scent to formulations and mask any undesirable natural odors of other ingredients.

Summary

fragrance

Science

Mechanism of Action

Methyl alpha-ionone isomers primarily function as fragrance ingredients in skincare products, enhancing the scent and masking unpleasant odors.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

As a fragrance component, Methyl alpha-ionone isomers are not typically dosed for specific skin benefits, rendering traditional 'dusting analysis' metrics (thresholds, red flag percentages) inapplicable.

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Safety

Safety Profile

CIR Status
Safe with restrictions
Max tested
32%
Sensitization risk High

Methyl ionone (a mixture of these isomers) has been evaluated by the Research Institute for Fragrance Materials (RIFM) and determined to be non-genotoxic and non-phototoxic/photoallergenic. However, Alpha-isomethyl ionone, a predominant isomer within this group, is recognized as a potential skin sensitizer and allergen. European Union regulations mandate its declaration on ingredient lists if concentrations exceed 0.001% in leave-on products or 0.01% in rinse-off products. The Expert Panel for Fragrance Safety provides specific usage limits across various product categories, with a maximum concentration of 32.00% permissible for products applied to the face/body by fingertips (IFRA Category 3).

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Avoid

Despite its role in enhancing product aroma, the documented high potential for skin sensitization and allergenicity positions Methyl alpha-ionone isomers as an ingredient to generally avoid in precision skincare formulations, particularly for sensitive skin types.

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