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mesterolone

CAS 1424-00-6
15

Safety score · 0–100

Avoid

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

Mesterolone is a cosmetic ingredient used in product formulations. Exercise caution due to limited available safety data.

Mesterolone is a synthetic anabolic androgenic steroid (1-methyl dihydrotestosterone). It is classified as CMR Category 1B under EU CLP and is listed on EU Cosmetics Regulation Annex II as a prohibited substance. It has no established safe use in cosmetic formulations and its androgenic activity poses significant dermatological and systemic risks.

Known concerns

  • CMR Category 1B substance
  • Banned under EU Cosmetics Regulation Annex II
  • Androgenic hormonal activity
  • Hepatotoxicity potential

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, so always read the physical product label and consult a healthcare professional for personal concerns.