Quick answer
Blend of isostearic acid and glycerin derivative; Primarily used as an emulsifier; Has lightweight emollient properties for skin; May be synthetic, animal-, or plant-derived Key benefits: Hydration.
Polyglyceryl-3 Diisostearate
Updated
1,2,3-Propanetriol, homopolymer, isodecanoates (1:2) (3 mol glycerol average molar ratio)
Purpose
A glycerin-derived emulsifier used to improve stability and aesthetics of skin care products in a cream or lotion base.
Rating
GOOD
Category
Emollient, Emulsifier, Cleansing Agent
INCI Purpose
SURFACTANT - EMULSIFYING
Benefits
Alternative Names
At a Glance
Blend of isostearic acid and glycerin derivative
Primarily used as an emulsifier
Has lightweight emollient properties for skin
May be synthetic, animal-, or plant-derived
Article
Polyglyceryl-3 diisostearate is primarily used as an emulsifier in cosmetics. Its lightweight feel and soft emolliency make it a desirable option to pair with or use in place of heavier emulsifiers. This ingredient also has cleansing properties but isn’t typically used for that purpose. It may be synthetic or plant-derived (the type Paula’s Choice uses) or, to a lesser extent, animal-derived.
Polyglyceryl-3 diisostearate is considered a diester (a chemical formed by reacting an acid with two alcohols) of the fatty acid isostearic acid and humectant polyglycerin-3.
Use levels of polyglyceryl-3 diisostearate in cosmetics range from 2–5%, depending on formulary needs. It’s insoluble in water but mixes readily with oils.
See: Isostearic Acid, Stearic Acid
References