Steareth-2

Steareth-2 is a low‑HLB ethoxylated fatty alcohol surfactant/emulsifier used to solubilize and stabilize formulations, typically at low single‑digit percentages. While generally well tolerated, ethoxylated surfactants can cause mild irritant contact dermatitis in reactive or barrier‑impaired skin—especially when combined with other surfactants or left on in compromised eczema skin. Given its surfactant nature and real-world cumulative exposure, a mild irritancy score is the safest clinically aligned assessment. Safety Notes: Steareth-2 is a low-HLB nonionic emulsifier/co-emulsifier most often used at very low levels (~0.1–0.5%) in lotions/creams and some hair/skin cleansers to support emulsification and texture. In consumer-available high-structure O/W creams, cleansing creams, and anhydrous-to-emulsion systems (often paired with higher-HLB ethoxylated stearyl alcohols like Steareth-20), total emulsifier loads can push Steareth-2 into the several-percent range, with the upper end around ~8% observed in specialized, high-emulsifier consumer products. It appears in both leave-on and rinse-off formats, with higher use levels more common where robust emulsification/viscosity building is needed rather than for direct skin benefit.