Ingredient review

Hydroxyethyl PEI-1000

INCI: Hydroxyethyl PEI-1000

A synthetic polymer that helps products spread smoothly and leaves a lightweight, non-sticky film on skin.

beautyskincarefilm-former

In plain English

Hydroxyethyl PEI-1000 is a man-made ingredient that acts like a gentle glue on your skin. It helps other ingredients stay put and gives products a silky, even feel without being heavy or greasy. Think of it as a helper that makes your skincare apply nicely and last longer.

Review score

Safety, usefulness, and evidence

3.8Good
3.8/ 5

Potentially useful with some tradeoffs

The evidence base is useful, but some claims depend heavily on the formula.

Risk flags are low for most users, though the finished product can still irritate.

Source
synthetic
Evidence
moderate
Irritation
low
Clogging risk
low
How reviews are scored

Quick decision guide

Useful, but context matters

Hydroxyethyl PEI-1000 is generally a lower-concern ingredient when the full formula suits your skin.

Plain-English read

Treat this as a practical screening step before you compare products that contain this ingredient.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Hydroxyethyl PEI-1000.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. Step 3If a product stings, breaks you out, or worsens irritation, judge the finished formula and stop using it even if the ingredient scores well.

Score terms in plain English

Irritation risk

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A synthetic polymer derived from polyethylenimine, modified with hydroxyethyl groups to make it water-soluble and skin-friendly.

How it works

It forms a thin, flexible film on the skin's surface, which helps lock in other ingredients and creates a smooth, even canvas. It also slightly thickens the product, improving its spreadability and feel.

Pros

Lightweight feel

Creates a barely-there film that doesn't feel heavy or sticky, making it ideal for daytime use under makeup.

Improves product performance

Helps serums and moisturizers spread evenly and stay on the skin longer, enhancing the overall user experience.

Cons and cautions

Synthetic origin

Derived from petrochemicals, which may be a concern for those seeking fully natural or biodegradable ingredients.

Limited long-term data

While generally considered safe, there is less published research on its long-term effects compared to more common polymers.

Best for

  • Anyone who prefers lightweight, non-sticky textures
  • People using makeup primers or long-wear products

Use caution if

  • Those strictly avoiding all synthetic ingredients
  • Individuals with known sensitivity to film-forming polymers

Usage tips

Use in serums or primers for a smooth base before makeup.
Combine with humectants like glycerin for added hydration under the film.

Safety summary

Hydroxyethyl PEI-1000 is considered safe for topical use at typical concentrations. It has low irritation and comedogenic potential, though those with very sensitive skin should patch test first.

Research notes

Research on Hydroxyethyl PEI-1000 is limited but consistent with other film-forming polymers. Safety assessments by cosmetic ingredient review panels have not raised significant concerns.

Common label clues

Typical concentration
0.1% to 2%
Regulatory status
Approved for use in cosmetics in the EU, US, and many other regions. No specific concentration restrictions are common.
Common uses
Serums, Moisturizers, Sunscreens, Makeup Primers
Environmental note
As a synthetic polymer, it is not biodegradable. However, it is used in very low concentrations, minimizing environmental impact.

Good to know

  • Often used in combination with other film-formers to achieve a specific texture.
  • Not a preservative or active ingredient—it's a texture enhancer.

Common questions

What is Hydroxyethyl PEI-1000 in beauty products?

Hydroxyethyl PEI-1000 is a man-made ingredient that acts like a gentle glue on your skin. It helps other ingredients stay put and gives products a silky, even feel without being heavy or greasy. Think of it as a helper that makes your skincare apply nicely and last longer.

What does Hydroxyethyl PEI-1000 do in a beauty product?

It forms a thin, flexible film on the skin's surface, which helps lock in other ingredients and creates a smooth, even canvas. It also slightly thickens the product, improving its spreadability and feel.

Is Hydroxyethyl PEI-1000 safe for most people?

Hydroxyethyl PEI-1000 is considered safe for topical use at typical concentrations. It has low irritation and comedogenic potential, though those with very sensitive skin should patch test first.

Who should be careful with Hydroxyethyl PEI-1000?

Those strictly avoiding all synthetic ingredients Individuals with known sensitivity to film-forming polymers

Research sources

Cosmetic Ingredient Review (CIR) - Safety of Polyethylenimine and DerivativesOpenPubChem - Hydroxyethyl PEI-1000OpenEuropean Chemicals Agency (ECHA) - Substance InformationOpen

Ingredient reviews are educational and are not medical advice. Patch test new products and ask a licensed clinician about persistent irritation, allergies, pregnancy-specific questions, or diagnosed skin conditions.