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Preservative

BENZISOTHIAZOLINONE

CAS 2634-33-5
22

Safety score · 0–100

Caution

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

Benzisothiazolinone (BIT) — a preservative with strong sensitiser properties. EU only allows it in rinse-off products at very low levels because allergic reactions are common.

Skin benefits

  • Effective preservative at low levels

Known concerns

  • Strong skin sensitiser
  • EU restricts to rinse-off only
  • High allergic contact dermatitis rate

References

EU

EU CosIng database

European Commission cosmetic ingredient registry: regulatory status, restrictions, authorised functions.

PC

PubChem

U.S. NIH compound data, GHS hazard codes and toxicity literature.

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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.