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Thiamazole (INN)

CAS 60-56-0
5

Safety score · 0–100

Avoid

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

About

Thiamazole (inn) is a cosmetic ingredient used in product formulations. Exercise caution due to limited available safety data.

Thiamazole (also known as methimazole) is an antithyroid pharmaceutical agent that inhibits thyroid hormone synthesis by blocking thyroid peroxidase. It is prohibited in cosmetic products under EU Regulation (EC) No 1223/2009 Annex II and does not appear in the CosIng database as a permitted cosmetic ingredient. The ingredient's pharmacological activity (effects on thyroid function) makes it entirely unsuitable for cosmetic application regardless of concentration.

Known concerns

  • Antithyroid pharmaceutical — prohibited in cosmetics (EU Annex II)
  • Pharmacological activity incompatible with cosmetic regulation
  • No CIR or SCCS safety assessment for cosmetics

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.