What it is
Poloxamer 188 is a member of the poloxamer family of nonionic block copolymers built from polyoxyethylene and polyoxypropylene units. It is used in skin care and sunscreen formulas as a gentle surfactant that helps disperse oils, stabilize emulsions, and solubilize ingredients in the water phase. The specific numbering reflects its particular block ratio and molecular size within the poloxamer series.
Safety & warnings
Poloxamer 188 is a mild, nonionic surfactant with a long record of cosmetic use and is generally well tolerated, including in rinse-off and leave-on products. It is considered low in irritation potential at typical use levels.
Origin & sourcing
Synthetic; manufactured as a block copolymer of ethylene oxide and propylene oxide.
Questions everyone asks
What does Poloxamer 188 do in a formula?
It acts as a mild surfactant that helps emulsify oils, solubilize ingredients, and gently cleanse, supporting the stability and texture of the product.
Is Poloxamer 188 harsh on skin?
It is a nonionic surfactant generally regarded as mild and low in irritation potential at the levels used in cosmetics.