Ceteth-20 Phosphate

Ceteth-20 Phosphate is an ethoxylated phosphate ester surfactant/emulsifier typically used at low percentages (about 0.5–5%) to solubilize and stabilize formulations. As a surfactant-class ingredient, it carries a mild but real risk of stinging, barrier disruption, and irritant contact dermatitis—especially in eczema-prone or already-compromised skin—despite being widely tolerated in the general population. Given sensitive-skin clinical experience with ethoxylated surfactants and the potential for cumulative irritation in multi-step routines, a cautious 'mild' score is appropriate. Safety Notes: Ceteth-20 Phosphate is used mainly as an anionic phosphate emulsifier/solubilizer and is commonly present at low levels (~0.1–1%) in leave-on lotions/creams and some sunscreen/emulsion systems where it supports O/W emulsification and pigment dispersion. Higher-use consumer products (often rinse-off cleansers, cream cleansers, and some high-load emulsions/makeup bases) can push total emulsifier levels into the mid-single digits, with Ceteth-20 Phosphate observed up to ~8% in specialized OTC formulations designed for strong emulsification, high oil phase, or robust stability. No specific global maximum restriction is typically applied to this ingredient in cosmetics, so the upper end is mainly constrained by sensorial impact, irritation potential, and emulsion stability rather than regulation.