Polyglyceryl-6 Isostearate

Polyglyceryl-6 isostearate is a non-ionic emulsifier/surfactant typically used at low concentrations (about 0.5–5%) to stabilize oil-in-water systems, and it is generally well-tolerated in patch testing compared with harsher anionic surfactants. True irritation is uncommon, but as a surfactant/emulsifier it can contribute to barrier disruption or stinging in highly compromised skin when combined with other irritants, so I score it as very gentle rather than inert for patient safety. Safety Notes: Polyglyceryl-6 Isostearate is most often used as a nonionic emulsifier/co-emulsifier and solubilizing surfactant in leave-on creams/lotions and cleansing oils/makeup removers; at the low end (~0.1–0.5%) it appears as a secondary emulsifier or stabilizer in multi-emulsifier systems. In real-world consumer products, dedicated oil cleansers, cleansing balms, and high-load W/O or water-in-oil-like emulsions commonly push it into the mid-to-high single digits, with observed high-strength OTC formulas using about 10–12% as a primary emulsifier/structurant (higher levels are uncommon due to texture, cost, and potential for over-cleansing/drag).