What it is
Polyglyceryl-2 tetraisostearate is the tetraester of isostearic acid and diglycerin, giving it both oil-loving and water-loving regions that make it useful for stabilizing emulsions. In sunscreens it commonly helps disperse oils and pigments, particularly in water-in-oil systems and in products containing mineral UV filters or color. It also contributes a smooth, emollient feel to the finished product.
Safety & warnings
Polyglyceryl esters of this type are generally well tolerated and are considered low in irritation potential. As a branched-chain ester it is widely used in facial products and is not associated with a notable comedogenicity concern, and it is not a fragrance allergen.
Origin & sourcing
Synthetic ester typically derived from plant-sourced glycerin and isostearic acid (a branched fatty acid).
Questions everyone asks
Why is polyglyceryl-2 tetraisostearate used in mineral sunscreens?
It works as an emulsifier that helps disperse oils and mineral pigments evenly, which supports a smooth, uniform film.
Is it derived from plants?
The glycerin portion is typically plant-derived, and it is combined with isostearic acid to form the ester, though sourcing can vary by supplier.