What it is
Polyglyceryl-4 pentaoleate is formed by esterifying polyglycerin-4 with multiple units of oleic acid, giving a lipophilic, oil-loving emulsifier. Its low hydrophilic-lipophilic balance makes it well suited to stabilizing water-in-oil systems, including the oil-based vehicles often used in sun care. It also imparts a smooth, conditioned feel to the skin.
Safety & warnings
Polyglyceryl oleate esters are generally well tolerated in cosmetic use. Because the ester is based on oleic acid, very high levels in heavy formulas may feel rich on oil-prone skin, though the polyglyceryl ester itself is far less occlusive than free oleic acid.
Origin & sourcing
Synthesized from oleic acid, a fatty acid that can be sourced from plant or animal lipids, combined with polyglycerin derived from glycerin.
Questions everyone asks
Why use polyglyceryl-4 pentaoleate instead of a PEG emulsifier?
It provides water-in-oil emulsifying power while keeping a formula PEG-free, which some brands prefer for naturally positioned products.
Does it add oil to the skin?
It functions mainly as an emulsifier but also has mild emollient qualities that leave a smooth feel.