Polyglyceryl-3 Diisostearate

Concerns
Malassezia Feeding

What is Polyglyceryl-3 Diisostearate?

Polyglyceryl-3 Diisostearate is a non-ionic compound formed by esterifying polyglycerol-3, a short-chain polymer of glycerol, with diisostearic acid, a branched fatty acid typically sourced from vegetable oils like olive or safflower. This structure gives it amphiphilic properties, making it ideal for cosmetic formulations such as creams, lotions, makeup, and cleansers. As an emollient, it mimics natural skin lipids to smooth surface imperfections and enhance product spreadability. In its surfactant role, it reduces surface tension, supporting gentle cleansing and foaming actions. Primarily valued as an emulsifying agent, it forms protective films at oil-water interfaces, ensuring stable blends that resist separation and deliver consistent textures. Its branched chains provide a non-greasy feel compared to straight-chain alternatives, though its lipophilic nature influences suitability for certain skin types.

Comedogenic Rating 4/5 Higher risk of clogging pores
EWG Safety Rating 1 View on EWG →

Roles in Formulation

This ingredient serves the following purposes in cosmetic formulations:

Emollient
Softens and smooths skin by filling in surface roughness and improving slip; can also help reduce moisture loss when paired with occlusives and film formers.
Surfactant
Lowers surface tension to enable cleansing, emulsifying, and foaming; central to shampoos, body washes, and many emulsions and micellar systems.
Emulsifying agent
Enables stable mixing of oil and water phases by forming an interfacial film, helping create lotions, creams, and cleansers with consistent texture.

Benefits

Delivers a soft, smooth texture to skin surfaces through emollient action.

Supports stable mixing of oils and water in emulsions for even product consistency.

Facilitates mild cleansing and improved spreadability as a surfactant.

Who It's For

A quick guide for who this ingredient may suit (and who should be cautious).

Who May Benefit Who Should Avoid
Individuals with dry skin needing added softness and moisture retention.
People with oily skin due to potential pore-clogging effects.
Users of thick creams or lotions appreciating stable, non-separating formulas.
Individuals prone to Malassezia-related issues like fungal acne.
Those seeking emollients that provide slip without heavy greasiness.
Acne-prone users sensitive to comedogenic emollients.

Safety Notes

  • Recognized as safe for use in cosmetics at typical concentrations by regulatory reviews.
  • Exhibits low potential for irritation in standard formulations.

Frequently Asked Questions about Polyglyceryl-3 Diisostearate

What does Polyglyceryl-3 Diisostearate do in products?

It softens skin as an emollient, stabilizes oil-water mixes as an emulsifier, and aids cleansing as a surfactant.

Is it suitable for sensitive skin?

It shows low irritation potential, making it generally tolerable, but patch test for personal compatibility.

Why might it not work for oily skin?

Its emollient nature carries moderate comedogenic risk and may support Malassezia growth in prone individuals.