PEG-2 Soyamine
INCI: PEG-2 SOYAMINE
Reviewed by Rosie · Last updated 14 Aug 2026
A synthetic emulsifier that stabilises skincare formulations and helps blend oil and water
Best For Skin Types
All
Usage Frequency
As directed by product instructions
What Is PEG-2 Soyamine?
PEG-2 Soyamine is a synthetic ingredient derived from soya combined with polyethylene glycol (PEG), a polymer made from ethylene oxide. It functions as an emulsifier and surfactant in skincare products, meaning it helps oils and water mix together and remain stable within a formula.
In cosmetic formulations, this ingredient plays a structural role rather than a direct benefit to skin. Its primary job is to keep creams, serums and lotions from separating, ensuring a consistent texture and application experience.
How It Works
PEG-2 Soyamine is a surface-active molecule, meaning one part of its structure is attracted to water whilst another is attracted to oil. This dual affinity allows it to sit at the boundary between oil and water phases in a formula, preventing them from separating. Without emulsifiers like this, the oil and water components would naturally split apart over time.
The soya-derived component and polyethylene glycol chain work together to create a stable bridge between these immiscible (unmixable) ingredients, maintaining a uniform product throughout its shelf life.
Clinical Evidence & References
Research on polyethylene glycol compounds generally shows them to be well-tolerated in topical formulations at typical concentrations used in skincare. Studies examining related PEG emulsifiers indicate minimal irritation to normal or compromised skin at standard use levels.
Evidence specific to PEG-2 Soyamine in skincare is limited, though safety data on PEG compounds and soya-derived ingredients suggests a favourable safety profile for dermal application. PEG allergy is documented in the literature but remains rare, particularly at the lower molecular weights used in skincare products.
How to Use
PEG-2 Soyamine is typically used as a formulation ingredient rather than an active component, so there is no specific usage guidance required. Simply use the skincare product containing it as directed by the manufacturer. It works behind the scenes to maintain product stability and texture.
Safety & Precautions
Frequently Asked Questions
From the Clinic
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