Oleth-5 is a polyethylene glycol ether of oleyl alcohol, containing an average of five ethylene oxide units. It is a nonionic surfactant widely used as an emulsifier, solubilizer, and dispersant in personal care, cosmetic, and pharmaceutical formulations. Known for stabilizing oil-in-water emulsions, it enhances product texture and spreadability. Oleth-5 is valued for its mildness, versatility, and compatibility with a wide range of ingredients.