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2-METHYLBUTANE-2-THIOL

CAS 1679-09-0
58

Safety score · 0–100

Moderate

Derived from EU CosIng regulatory status, PubChem hazard data and published research. How we score.

About

A tertiary thiol with a strong odor, typically employed as a fragrance ingredient in cosmetics at very low concentrations.

2-Methylbutane-2-thiol (tert-pentyl mercaptan) is a tertiary thiol functioning primarily as a fragrance ingredient. It is not listed in EU Annexes II or III. Thiols are generally more toxic than their alcohol counterparts, and this compound's strong odor at low concentrations suggests high potency. Limited human toxicological data exists. In cosmetics, it would be used only at trace levels as a fragrance component, limiting systemic exposure.

Skin benefits

  • Used as a fragrance component at trace levels

Known concerns

  • Limited toxicological data in humans
  • Strong odor indicates high potency; low concentrations required
  • May cause respiratory irritation at higher exposures

References

EU

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.