Lauryl PEG-9 Polydimethylsiloxyethyl Dimethicone

Lauryl PEG-9 Polydimethylsiloxyethyl dimethicone is a PEG-modified silicone surfactant/emulsifier used at low levels (typically ~0.5–5%) to improve slip and stabilize oil/water phases. Silicones themselves are generally low-irritant, but the PEG-lauryl portion adds mild surfactant character that can increase sting or barrier disruption in highly compromised or eczema-prone skin, especially when combined with other cleansers/actives in a routine. Clinically, it is usually well tolerated and not a common sensitizer, but I score it as very gentle rather than inert to reflect occasional reactivity in severely sensitive populations. Safety Notes: Lauryl PEG-9 Polydimethylsiloxyethyl Dimethicone is a silicone polyether surfactant/emulsifier most often used at low levels (~0.1–1%) in leave-on emulsions and sunscreens to improve spread, sensorial slip, and emulsion robustness. In consumer-available high-silicone primers, makeup/skincare hybrids, and water-in-silicone systems (including some long-wear SPF formats), it can be pushed into the mid–high single digits as a primary or co-emulsifier, with ~5–8% representing the upper end observed in OTC products. No specific EU/FDA maximum is set for this INCI, so practical usage is primarily constrained by stability, viscosity, and skin feel rather than regulatory limits.