Polyethylglutamate: What Is It, Cosmetic Uses, Benefits & Side Effects

Curious about this ingredient? In this article we're explaining exactly what it is and why it's used within cosmetic formulations.
Updated on: July 1, 2025
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We verify all information on this page using publicly available nomenclature standards from The Personal Care Products Council (PCPC), the European Commission's CosIng database and documentation provided directly by ingredient manufacturers. Our analysis is based on technical data from these sources to ensure accuracy and reliability.

What Is Polyethylglutamate?

Polyethylglutamate is a synthetic polymer created from glutamic acid, an amino acid naturally found in many proteins. Chemically, it is a long chain of ethylated glutamate units that link together to form a lightweight flexible film when spread on the skin. Researchers first explored similar polymers while looking for biodegradable water-binding materials in the food industry, and formulators soon realized the same film-forming trait could benefit cosmetics. Production starts with fermenting plant-sourced sugars to obtain glutamic acid, which is then converted to its ethyl ester and polymerized under carefully controlled heat and pH. The finished ingredient appears as a clear to pale yellow liquid or fine powder, easy to blend into water-based systems. Today you will most often spot polyethylglutamate in sheet masks, hydrating serums, primers, light moisturizers and certain long-wear makeup products where a smooth flexible film is desirable.

Polyethylglutamate’s Cosmetic Benefits/Uses

In skin care formulas polyethylglutamate delivers one key benefit.

As a film forming agent it lays down an invisible breathable layer that helps seal in water, smooth uneven skin texture and improve the spread and staying power of other ingredients. This film can give the complexion a soft supple feel and can keep makeup in place for longer without tightness or flaking.

Who Can Use Polyethylglutamate

Polyethylglutamate suits most skin types thanks to its lightweight breathable film. Dry and combination skin benefit from the extra moisture retention while oily skin appreciates that it leaves no greasy residue. Extremely sensitive or highly reactive skin could still experience irritation with any new polymer so extra caution is advised for those groups.

The ingredient is considered vegan and vegetarian friendly because current manufacturing starts with plant-derived sugars fermented into glutamic acid without using animal products or by-products.

No studies have flagged polyethylglutamate as a concern for pregnancy or breastfeeding when used topically in standard cosmetic concentrations. That said this is not medical advice and anyone who is pregnant or nursing should review all skincare choices with a qualified healthcare provider just to be safe.

Polyethylglutamate does not increase photosensitivity therefore it will not make skin more prone to sunburn. There are also no known issues with using it alongside retinoids acids or exfoliating acids although its film may slightly slow absorption of heavier oils.

Potential Side Effects/Adverse Reactions

Individual responses can vary and the following list covers possible reactions not the typical experience. When used as intended by reputable manufacturers most people enjoy polyethylglutamate with no problems.

  • Mild skin irritation such as itching or redness
  • Transient tight or dry feeling if the film is layered too heavily
  • Possible clogged pores in very acne-prone skin when combined with other occlusives
  • Rare allergic contact dermatitis in people sensitive to synthetic polymers

If you notice any persistent discomfort stop using the product and consult a healthcare professional or dermatologist.

Comedogenic Rating

Rating: 1/5. Polyethylglutamate is water soluble and forms a thin breathable film that rinses off easily so it has little tendency to trap oil or dead cells inside pores. It lacks the heavy waxes and fatty acids typically linked to clogged follicles which keeps its pore-clogging potential low.

With this low score it is generally suitable for people prone to acne or breakouts as long as the rest of the formula is likewise lightweight.

Remember that overall pore impact depends on the finished product; combining this polymer with rich butters or high levels of silicones can push the comedogenic load higher.

Summary

Polyethylglutamate mainly works as a film former that locks in moisture smooths surface texture and helps makeup stay put by creating a flexible network on the skin. Its light water-friendly structure delivers these benefits without a greasy afterfeel.

While not a headline ingredient it is quietly appearing in more serums sheet masks and primers thanks to its clean finish and reliable performance.

Available data shows it to be safe for most users with only occasional mild irritation. Still it is wise to patch test any new product containing polyethylglutamate before full use just to stay on the safe side.

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