What it is
PEG-150 is a polyethylene glycol with a high average molecular weight, supplied as a solid or waxy material that is water-soluble. In formulations it is used mainly to increase viscosity and to bind water, helping build body in aqueous systems and surfactant blends. It is often combined with other PEG esters as a thickening system.
Safety & warnings
PEG-150 is generally well tolerated and is not associated with notable allergen or comedogenicity concerns at cosmetic use levels.
Origin & sourcing
PEG-150 is synthetic, produced by polymerizing ethylene oxide.
Questions everyone asks
What is PEG-150?
It is a high-molecular-weight polyethylene glycol used mainly as a water-soluble thickener and humectant.
Why is it added to sunscreen?
It helps thicken aqueous formulas and bind water, contributing to texture and stability.