Polyglyceryl-3 Oleate is a non-ionic, PEG-free emulsifier and co-emulsifier produced by esterifying polyglycerin-3 with oleic acid. Owing to its amphiphilic structure and relatively low hydrophilic–lipophilic balance (HLB), it is particularly effective in water-in-oil (W/O) emulsions, microemulsions, and oil-rich systems. In skincare formulations, Polyglyceryl-3 Oleate contributes to emulsion stability, improved spreadability, and enhanced sensory softness, while maintaining excellent compatibility with the stratum corneum. Its fatty-acid backbone (oleate) provides a mild emollient effect and supports lipid continuity at the skin surface, which can help reduce transepidermal water loss (TEWL) when used within structured lipid systems.

In haircare, Polyglyceryl-3 Oleate is commonly used as a secondary emulsifier or solubilizing agent in conditioners, cleansing oils, and creamy shampoos. It facilitates the uniform distribution of oils, esters, and lipophilic actives across the hair fiber and scalp, improving rinse behavior and product consistency. Although it does not directly modify hair biology, its ability to stabilize oil-rich phases enhances the performance of conditioning agents and contributes to smoother application, reduced friction, and improved combability. Its mildness profile makes it especially suitable for sulfate-free, low-irritation haircare systems.