Back to Ingredient Dictionary

BENZISOTHIAZOLINONE

Description

Benzisothiazolinone is a synthetic preservative widely used in cosmetics, personal care products, and industrial formulations. This water-soluble compound belongs to the isothiazolinone family and is known for its broad-spectrum antimicrobial activity against bacteria, fungi, and yeasts. Its efficacy in preventing microbial growth helps extend the shelf life of products and maintains their integrity.

Typically used at low concentrations ranging from 0.01% to 0.1%, benzisothiazolinone is effective in both leave-on and rinse-off formulations. It performs well across a wide pH range and is compatible with many other cosmetic ingredients. This preservative is particularly valued for its stability in the presence of proteins and its ability to function in alkaline environments.

While benzisothiazolinone offers excellent preservation properties, it has been associated with skin sensitization in some individuals. As a result, regulatory bodies have established usage limits and labeling requirements. Formulators often combine it with other preservatives to achieve optimal protection while minimizing potential adverse reactions. When used within recommended guidelines, benzisothiazolinone contributes to product safety by preventing contamination and maintaining the efficacy of active ingredients in skincare and cosmetic formulations.