Emulsifier

PEG-20 Evening Primrose Glycerides

INCI: PEG-20 EVENING PRIMROSE GLYCERIDES

Reviewed by Emma · Last updated 14 Aug 2026

A plant-derived emulsifier that helps stabilise skincare formulations

Best For Skin Types

All, Oily, Dry, Combination, Sensitive, Mature, Acne-prone

Addresses

Barrier repair

Usage Frequency

Daily

What Is PEG-20 Evening Primrose Glycerides?

PEG-20 Evening Primrose Glycerides is a processed derivative of evening primrose oil, combined with polyethylene glycol (PEG) to create a water-soluble ingredient. It functions primarily as an emulsifier, helping to blend water and oil-based components into stable formulations that don't separate over time.

Evening primrose oil itself contains linoleic acid and other fatty acids, though the degree to which these remain bioavailable after processing into this ingredient form is unclear. The inclusion of this ingredient in a formulation is largely about texture and stability rather than direct skin benefit.

How It Works

As an emulsifier, PEG-20 Evening Primrose Glycerides acts as a bridge between water and oil molecules, which naturally repel one another. It positions itself at the interface between these two phases, allowing them to mix evenly and remain blended rather than separating into distinct layers.

The evening primrose component may theoretically offer some skin-conditioning properties, though in this chemically modified form, it functions primarily as a functional ingredient rather than a skincare active.

Clinical Evidence & References

Research specifically examining PEG-20 Evening Primrose Glycerides and its skin benefits is limited. Most evidence base focuses on evening primrose oil itself, which has been studied for inflammatory skin conditions and barrier function—however, it is unclear how much of these properties transfer to this processed, emulsified form.

The ingredient is well-established as an effective emulsifier in cosmetic chemistry, but direct clinical evidence for skin benefits specific to this ingredient is sparse. It is best viewed as a formulation stabiliser rather than an active treatment ingredient.

How to Use

No specific usage guidance is required; this ingredient works passively within formulations. Its presence ensures your product remains well-mixed and applies smoothly. As part of a complete skincare routine, use products containing this ingredient as directed on their packaging.

Safety & Precautions

PEG-20 Evening Primrose Glycerides is generally well-tolerated, though those with evening primrose sensitivity should review full ingredient lists. It is non-comedogenic and suitable for most skin types.

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Other forms of PEG-20 Evening Primrose Glycerides

These appear on ingredients lists under different names but are the same substance. PEG-20 Evening Primrose Glycerides is the common form.

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