Cetrimonium Bromide

Cetrimonium bromide (CTAB) is a quaternary ammonium compound—a type of positively charged molecule derived from ammonium salts. In skincare formulations, it functions primarily as a preservative and antimicrobial agent, helping to prevent microbial contamination and extend product shelf life.It also has antistatic and emulsifying properties, making it useful in formulations where these functions are needed. Whilst commonly used in disinfectant products, it appears in a small proportion of skincare products at relatively low concentrations.

Cetrimonium bromide works by disrupting the cell membranes of bacteria and fungi. Its positively charged molecular structure allows it to interact with and destabilise the negatively charged outer layers of microbial cells, inhibiting their growth and reproduction.In formulations, it also reduces static electricity and can help stabilise mixtures of oils and water-based ingredients through its emulsifying properties, contributing to overall product performance.

Products containing this ingredient should be used as directed. If you have a known sensitivity to quaternary ammonium compounds or a history of contact dermatitis, introduce any new product slowly and monitor your skin's response. Discontinue use if irritation develops.

Generally recognised as safe in cosmetic formulations at typical use levels. However, quaternary ammonium compounds can trigger contact sensitivity or irritation in some individuals, particularly those with sensitive or damaged skin barriers.