C11-15 Pareth-7

C11-15 Pareth-7 is a nonionic ethoxylated surfactant/solubilizer used in cleansers and emulsions (often ~0.5–5%+, higher in rinse-off systems), and surfactants are a common cause of barrier disruption and stinging in eczema-prone skin. While generally considered milder than anionic detergents, clinical experience and patch testing show occasional irritant reactions, especially with compromised skin or leave-on exposure. Given its surfactant role and cumulative irritation potential in routines, I rate it as mild rather than gentle for sensitive populations. Safety Notes: C11-15 Pareth-7 is a nonionic surfactant/solubilizer used at very low levels (~0.05–0.5%) in leave-on lotions/serums and facial moisturizers mainly to aid solubilization and improve spreading, and more commonly around 1–5% in rinse-off cleansers and micellar/cleansing products as part of the surfactant system. In high-strength consumer-available products such as concentrated makeup removers, cleansing oils/balms that rely on ethoxylated nonionics for self-emulsification, and some concentrated body washes, total usage can reach ~10–20% as a primary surfactant/emulsifier; higher levels are constrained by irritation potential and formula aesthetics rather than a specific global regulatory maximum.