What it is
Polyglyceryl-4 laurate is an ester formed from a tetramer of glycerol and lauric acid, giving it both a hydrophilic polyglycerol head and a lipophilic fatty acid tail. In sunscreens and other emulsions it acts as a nonionic emulsifier and mild surfactant, helping disperse oil and water phases and stabilize the formula. It is a common choice in formulas marketed as gentle or sulfate-free because of its mild, nonionic character.
Safety & warnings
Polyglyceryl esters are generally regarded as mild and well tolerated, with low irritation potential, which is why they are favored in formulas aimed at sensitive skin. As a nonionic emulsifier it is not a recognized fragrance allergen. Comedogenicity data are limited; like many fatty-acid-derived emulsifiers it is used at modest levels where pore-clogging is not typically a concern.
Origin & sourcing
Derived from glycerol and lauric acid, both of which are commonly sourced from plant oils such as coconut or palm; the polyglycerol portion is made by polymerizing glycerin.
Questions everyone asks
What does polyglyceryl-4 laurate do in a sunscreen?
It works as a nonionic emulsifier and mild surfactant, helping keep the oil and water phases blended into a stable, uniform product.
Is polyglyceryl-4 laurate a harsh detergent?
No. It is a nonionic, relatively mild surfactant and is often selected for gentle, sulfate-free formulations rather than for strong foaming or cleansing.