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Moumoujus

ISOMETHYL-BETA-IONONE.

Avoid CAS 79-89-0 / PERFUMING

ISOMETHYL-BETA-IONONE is a synthetic aromatic compound, a member of the ionone family, frequently incorporated into cosmetic formulations. It is valued for its pleasant floral-woody scent profile, serving primarily as a fragrance component or to effectively mask undesirable odors.

Summary

Fragrance Masking Agent

Science

Mechanism of Action

This ingredient functions exclusively as a fragrance, interacting with olfactory receptors to impart a specific aroma. It does not confer any direct therapeutic benefits or physiological effects upon the skin itself.

Research

Clinical Evidence

Low confidence
Effective range N/A
Optimal

N/A

Transparency

Dusting Analysis

Not commonly dusted

As ISOMETHYL-BETA-IONONE serves solely as a fragrance ingredient, its inclusion is for sensory purposes rather than active efficacy, making 'dusting' in the context of performance claims irrelevant.

The Formula

Formulation

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

The ingredient demonstrates robust stability and is non-discoloring across a wide range of cosmetic matrices, including bath foams, detergents, hair sprays, shampoos, and soaps.

Conflicts

  • strong Lewis acids
  • mineral acids
  • halogens (under uncontrolled conditions)
  • free radical initiators
  • oxidizing agents
  • nitrogen oxides and oxygen (potential for explosive addition products at low temperatures, with subsequent explosion upon heating)

Safety

Safety Profile

CIR Status
Safe with restrictions
Max tested
1.6%
Sensitization risk High

The CIR Expert Panel has deemed related isomers, such as Alpha-Isomethyl Ionone, safe for cosmetic use within regulated concentrations, often deferring to IFRA for specific guidelines. However, the SCCS in the European Union has classified several ionones as established contact allergens. The FDA has removed beta-isomethylionone as a flavoring agent but applies general safety assessments for cosmetic fragrance ingredients. Due to documented dermal sensitization risks, IFRA imposes stringent maximum concentration limits, which vary significantly by product type; for example, a maximum of 1.6% is permitted in products applied to the axillae, contrasting with 5.4% for lip products.

Your Skin

Skin Compatibility

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

Our Assessment

Verdict

Avoid

As a known potential skin sensitizer and a pure fragrance ingredient offering no direct dermal benefits, ISOMETHYL-BETA-IONONE is not aligned with precision skincare principles and should be avoided, particularly for sensitive skin types.

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