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TRIMETHYL-2-CYCLOHEXENE-1,4-DIONE.

Questionable CAS 1125-21-9 / PERFUMING

TRIMETHYL-2-CYCLOHEXENE-1,4-DIONE, also known as 4-ketoisophorone, is a cyclic olefin naturally occurring in saffron spice and as a product of carotenoid degradation. Primarily utilized as a flavoring and fragrance agent, its specific application or efficacy within a skincare context remains largely undefined.

Science

This compound is a cyclic olefin and a key component found in saffron. While identified as a degradation product of carotenoids, detailed mechanistic data regarding its specific interaction or effects on human skin are not currently available in the provided research.


Research

Low confidence
Effective range N/A
Optimal

N/A


Transparency

Not commonly dusted

The Formula

Solubility
Oil
Optimal pH N/A
0 7 14

Stability

For optimal stability, the ingredient should be stored below +30°C in a tightly closed container within a cool, well-ventilated environment. It is also advised to store it under an inert gas due to its air-sensitive nature.

Conflicts

  • General incompatible materials (specifics not detailed)

Safety

CIR Status
Not reviewed
Sensitization risk Moderate

The Research Institute for Fragrance Materials (RIFM) has assessed its use as a fragrance ingredient, concluding it is not genotoxic and poses no phototoxicity/photoallergenicity risk. While existing data suggest it can act as a sensitizer, RIFM found no safety concerns at current fragrance use levels, as exposure remains below the Dermal Sensitization Threshold. Conversely, the European Chemicals Agency (ECHA) GHS classification indicates it is harmful if swallowed, may cause an allergic skin reaction, and is noted as 'Irritating to skin' and 'May cause sensitisation by skin contact'. The FDA lists it as a flavoring agent (FEMA 3421, JECFA 1857), though there is a record of the FDA no longer providing for the use of certain synthetic flavoring substances, which may relate to specific contexts for this ingredient.


Your Skin

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

Our Assessment

Questionable

While a component of saffron, TRIMETHYL-2-CYCLOHEXENE-1,4-DIONE lacks documented skin-specific mechanisms or clinical efficacy data for skincare applications, and carries a moderate risk of skin irritation and sensitization based on regulatory classifications, despite RIFM's findings at low fragrance concentrations.


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