Sodium Methyltaurate

Sodium methyltaurate is primarily used as a mild anionic surfactant/cleansing agent (often in the low single-digit % range up to ~10% in rinse-off formulas) and is generally better tolerated than harsher sulfates, but it can still disrupt barrier lipids and sting on compromised skin. Patch-test and consumer-use data typically place taurate surfactants in the low-irritancy category, yet eczema-prone and post-procedure patients can experience dryness or burning with repeated exposure, especially in multi-surfactant routines. Given its surfactant function and real-world cumulative cleansing exposure, I score it as gentle rather than “very gentle.” Safety Notes: In commercial skincare, sodium methyltaurate is most commonly used as an anionic co-surfactant/viscosity builder in mild facial cleansers and foaming products, where it can appear at very low levels (~0.05–0.3%) as a supporting surfactant or secondary thickener. Typical rinse-off cleansers are often ~1–4% depending on the total active surfactant system, while high-strength consumer-available cleansers and shampoo/body-wash type formulas using methyltaurate-based systems can reach ~6–8% (higher if expressed as total surfactant blend rather than this single component). It is generally used in rinse-off products far more than leave-on, where use levels tend to stay at the low end due to sensorial and surfactant-related irritation constraints rather than regulatory limits.