Science
Mechanism of Action
This ingredient functions solely as an aroma chemical, imparting a distinct scent to formulations. There is no identified mechanism of action by which Methylcyclopentenolone provides therapeutic or cosmetic benefits to the skin.
Research
Clinical Evidence
Low confidenceN/A
Transparency
Dusting Analysis
Methylcyclopentenolone is primarily a fragrance ingredient without identified active precision skincare benefits. It is not typically 'dusted' by misrepresenting minor effects, but its inclusion for reasons other than scent in a precision formulation would lack scientific justification.
The Formula
Formulation
Stability
The compound exhibits stability under normal ambient temperatures. It should be incorporated into formulations during the final processing stage, with temperatures maintained below 40°C. Optimal storage conditions include a tightly sealed container, protected from both light and heat.
Safety
Safety Profile
Methylcyclopentenolone is classified as a Skin Sensitizer Category 1 and Serious Eye Damage Category 1. While human skin irritation tests at 3% and rabbit tests at 100% indicated no irritation, severe eye irritation was observed with undiluted material in an in vitro assay. Skin sensitization data is conflicting; a human maximization test at 3% and an in vitro LuSens assay showed no evidence of sensitization, yet it was active in a DPRA in chemico analysis. It also holds an Acute Oral Toxicity Category 4 classification. The Cosmetic Ingredient Review (CIR) has not assessed this ingredient.
Your Skin
Skin Compatibility
Our Assessment
Verdict
Methylcyclopentenolone offers no identified skin benefits, and its classification as a Skin Sensitizer Category 1 and Serious Eye Damage Category 1, combined with unreviewed CIR status, deems it unsuitable for precision skincare formulations.
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References
Sources