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Bithionol (INN)

CAS 97-18-7
5

Safety score · 0–100

Avoid

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

About

Bithionol (inn) is a cosmetic ingredient. Raw material has significant toxicity. Exercise caution due to limited available safety data.

Bithionol is listed in EU Regulation (EC) No 1223/2009 Annex II (banned substances) under entry 44. It was formerly used as an antiseptic agent but was found to cause severe phototoxic skin reactions upon UV exposure, leading to its prohibition in leave-on and rinse-off cosmetic formulations alike.

Known concerns

  • Prohibited in EU cosmetics (Annex II)
  • Photosensitizing agent causing skin reactions on UV exposure
  • Phototoxicity risk

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.