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Banned Substance

Sodium 4-(4-hydroxy-3-iodophenoxy)-3,5-diiodophenylacetate

CAS 1477-04-9
4

Safety score Β· 0–100

Avoid

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

Sodium salt of triiodothyroacetic acid (tiratricol/Triac), a thyroid-hormone analogue. Listed in EU Annex II β€” banned in cosmetics. Even small absorbed doses can disrupt thyroid function.

Skin benefits

  • No legitimate benefit in cosmetics β€” banned

Known concerns

  • EU Annex II banned thyroid-active substance
  • Triiodothyroacetic acid analogue β€” affects thyroid axis
  • Pharmaceutical, not cosmetic
  • Endocrine effects on systemic absorption

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.