METHOXY-METHYLBUTANETHIOL
Safety score · 0–100
Moderate
Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.
About
A thioether-substituted butane thiol (sulfur compound) used as a fragrance ingredient with characteristic roasted, coffee-like odor notes.
Methoxy-methylbutanethiol is a sulfur-containing fragrance compound contributing roasted, savory, and coffee-like odor notes at very low concentrations. Sulfur compounds in the thiol class are intrinsically reactive and can cause sensitisation reactions in susceptible individuals. This ingredient is not specifically listed on EU Annex II or III restrictions but its chemical class (thiols) warrants attention to use levels. Thiols can also react with proteins on the skin surface, potentially leading to allergic contact dermatitis.
Skin benefits
- Provides distinctive roasted, savory fragrance notes at low concentrations
Known concerns
- Thiol class inherently reactive - potential sensitiser
- Very potent odorant requiring careful concentration control
References
EU CosIng database
European Commission cosmetic ingredient registry — regulatory status, restrictions, authorised functions.
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This profile is for educational purposes and does not constitute medical advice. Regulatory status and scientific understanding evolve — always read the physical product label and consult a healthcare professional for personal concerns.