Cetyl Hydroxyethylcellulose

Cetyl Hydroxyethylcellulose is a cellulose-derived, fatty-alkyl modified thickener/stabilizer used at low concentrations (typically well under 1%) to improve texture and emulsion stability. As a high–molecular weight, non-volatile polymer, it has minimal skin penetration and is generally well tolerated in patch testing, with irritation mainly limited to rare cases in highly reactive or severely barrier-impaired skin. Given its broad use in “sensitive skin” formulations and low intrinsic reactivity, it fits a very gentle profile rather than completely inert. Safety Notes: Cetyl Hydroxyethylcellulose is used as a nonionic associative thickener/rheology modifier and stabilizer in emulsions and surfactant systems; in commercial leave-on lotions/serums and rinse-off cleansers it is often present at low levels (~0.05–0.3%) to provide light viscosity build and suspension without tack. Higher-viscosity consumer creams, body butters, hair conditioners, and styling products can push usage into the ~1–3% range to achieve strong gel-network structure and stability, with levels above this being uncommon in OTC products due to processing difficulty and excessive viscosity/drag.