Isothiazolinone (CMIT/MIT) is a biocide used as a preservative and antimicrobial agent in various formulations. It is a mixture of Methylisothiazolinone (MIT) and Chloromethylisothiazolinone (CMIT). CMIT/MIT is effective in preventing the growth of bacteria, fungi, and other microorganisms in water-based products like cosmetics, personal care items, household cleaners, and industrial products. It is widely used due to its powerful preservative action at low concentrations, though its use has been limited in some regions due to sensitization concerns.