PEG-20 Stearate
INCI: PEG-20 STEARATE
Reviewed by Kate · Last updated 14 Aug 2026
Also known as: Peg-20 Stearate
A synthetic emulsifier that helps bind water and oil in skincare formulations
Best For Skin Types
All
Addresses
Usage Frequency
Daily
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What Is PEG-20 Stearate?
PEG-20 Stearate is a synthetic emulsifier derived from stearic acid and polyethylene glycol (PEG). It functions as a surfactant, meaning it has both water-loving and oil-loving properties, which allows it to blend ingredients that would normally separate.
In skincare products, it serves primarily to stabilise emulsions—keeping water and oil phases mixed together. It also has mild humectant properties, meaning it can help attract and retain water in the formula and on the skin's surface.
How It Works
PEG-20 Stearate works by positioning itself at the boundary between water and oil molecules. One end of the molecule is attracted to water, whilst the other is attracted to oil, allowing these immiscible substances to remain blended rather than separating.
As a humectant, it can also draw water from the air and deeper skin layers to the outer skin surface, supporting overall hydration.
Clinical Evidence & References
Safety assessments have found PEG-based emulsifiers to be well-tolerated in cosmetic formulations. Research on related PEG derivatives suggests they are poorly absorbed through the skin, reducing systemic exposure concerns.
Direct clinical efficacy studies specific to PEG-20 Stearate are limited, so its skin benefits are inferred primarily from its functional role as an emulsifier and mild humectant rather than from robust independent research.
How to Use
PEG-20 Stearate is a formulation ingredient, so there is no separate usage guidance. Simply use the product containing it according to the manufacturer's instructions. It is typically present in very small concentrations and does not require special application technique.
Safety & Precautions
Frequently Asked Questions
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PEG-20 Stearate is a variant of PEG-100 Stearate, the form you will most often see on an ingredients list.
Multitasking ingredient that can be used as an emulsifier/cleansing agent in cosmetic formulas | May also be utilized to deliver a soft, moisturised feel to skin, thanks to its emollient properties
Related Ingredients
PEG-100 Stearate
Multitasking ingredient that can be used as an emulsifier/cleansing agent in cosmetic formulas | May also be utilized to deliver a soft, moisturised feel to skin, thanks to its emollient properties
PEG-40 Stearate
Typically functions as a cleansing agent in skin care formulas | Can also be used as a thickener/texture enhancer or to help keep ingredients soluble
PEG-75 Stearate
A surfactant that helps stabilise and blend formulations, commonly used in sunscreens and cleansers
PEG-30 Stearate
Made from polyethylene glycol and stearic acid | Has cleansing, emulsifying, suspending, and solubolizing properties
PEG-8 Stearate
A surfactant and emulsifier that helps blend oil and water-based ingredients
PEG-20 Hydrogenated Castor Oil
A plant-derived emulsifier that helps blend water and oil in skincare formulas
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