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2-Methyl-2H-isothiazol-3-one
May aggravate
Safety summary
While effective, it is a known sensitizer and can cause allergic reactions, especially in leave-on products. Many brands have reduced its use or removed it due to concerns about contact allergies.
CAS Number
2682-20-4
For informational purposes only. This is not medical advice. Always patch test new products and consult a dermatologist for skin concerns.