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Banned Substance

Thyropropic acid (INN) and its salts

CAS 51-26-3 Updated
5

Safety score · 0–100

Avoid

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

About

A thyromimetic drug substance listed on EU Annex II — fully prohibited in cosmetic products at any meaningful concentration due to its endocrine-active profile.

Skin benefits

  • No cosmetic benefits at allowed levels

Known concerns

  • EU Annex II banned in cosmetics
  • Thyromimetic activity affecting thyroid hormone receptors
  • Endocrine-disrupting 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 — always read the physical product label and consult a healthcare professional for personal concerns.