A preservative from the isothiazolinone family, kin to the notorious methylisothiazolinone. A strong contact allergen. EU rules do not allow it in leave-on cosmetics; it shows up mainly in household products and rinse-off items.
Topical application
CWeak evidence. In vitro data, open-label studies, or expert consensus.
An effective preservative with high allergen potential. Not allowed in EU leave-on cosmetics. People allergic to isothiazolinones do well to avoid it in rinse-off products too.
Irritation potential
MediumAllergen risk
HighPregnancy
CautionSuitable for
Use with caution
The Evigrade extension adds an evidence panel to Wildberries, Goldapple, Letu, iHerb, Sephora and 12 more stores. This ingredient and every other one in the product show evidence-tier, allergen risk and pregnancy/lactation flags at a glance.
Benzisothiazolinone should be used with caution during pregnancy. Consulting a dermatologist or OB-GYN is advisable.
Benzisothiazolinone suits: normal, oily. Use with caution in: sensitive, dry.
Benzisothiazolinone has moderate irritation potential. Sensitive skin may show a transient reaction that usually settles with adaptation.
Benzisothiazolinone has high allergen potential. Perform a patch test on the inner forearm 24 hours before facial application.
A preservative from the isothiazolinone family, kin to the notorious methylisothiazolinone.
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The INCI name is Benzisothiazolinone. It may also appear as: BIT, 1,2-Benzisothiazolin-3-one, Бензизотиазолинон.