Ingredient review

Adipic Acid/Methyl DEA Crosspolymer

INCI: ADIPIC ACID/METHYL DEA CROSSPOLYMER

A synthetic polymer that helps products stay put and resist water, but offers no active skincare benefit.

beautyskincarefilm-former

In plain English

This ingredient is a man-made polymer that forms a thin, flexible film on your skin. It helps makeup and sunscreen stay in place longer and resist water and sweat. Think of it like a clear, breathable shield that keeps your product from sliding off. It doesn't moisturize or treat your skin—it's purely a texture and performance helper.

Quick decision guide

Useful, but context matters

Adipic Acid/Methyl DEA Crosspolymer 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 Adipic Acid/Methyl DEA Crosspolymer.
  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 crosslinked polymer created by reacting adipic acid with methyl DEA (a type of amine). It forms a flexible film when applied to skin.

How it works

When applied, the polymer molecules link together to create a continuous, water-resistant film on the skin's surface. This film helps other ingredients adhere better, reduces transfer, and improves the longevity of the product.

Pros

Long-lasting wear

Creates a flexible film that helps makeup and sunscreen stay in place for hours, even in humid or wet conditions.

Water and sweat resistant

Forms a barrier that repels moisture, making it ideal for swim-proof sunscreens and waterproof eyeliners.

Cons and cautions

No skin benefit

This ingredient is purely functional—it does not hydrate, soothe, or treat the skin in any way.

May require double cleansing

The film it forms can be stubborn to remove with water alone, often needing an oil-based cleanser or micellar water.

Best for

  • Anyone wanting long-wearing or waterproof makeup
  • People who need sunscreen that stays put during swimming or sweating
  • Those who prefer products with a smooth, non-greasy finish

Use caution if

  • Individuals with very dry or dehydrated skin who prioritize hydration over wear time
  • Those who prefer minimal-ingredient or all-natural formulations

Usage tips

Use an oil-based cleanser or micellar water to fully remove products containing this polymer.
Layer over moisturizer to avoid any potential tightness on dry skin.
Ideal for setting sprays or primers if you want extra staying power.

Safety summary

Considered safe for topical use at typical concentrations. Low irritation and comedogenic risk. No known systemic toxicity from cosmetic use.

Research notes

Limited independent studies on this specific polymer, but the class of crosslinked polymers is well-studied and generally regarded as safe for cosmetic use. Safety assessments rely on analog data from similar film-formers.

Common label clues

Typical concentration
1% to 10%
Regulatory status
Approved for use in cosmetics in the US, EU, and other major markets. No specific concentration restrictions, but typical use levels are low.
Common uses
Sunscreens, Waterproof makeup, Long-wear foundations, Eye liners
Environmental note
As a synthetic polymer, it is not biodegradable. However, it is used in small amounts and is not known to accumulate in the environment.

Good to know

  • Commonly found in 'transfer-proof' and '24-hour wear' makeup formulas.
  • Often combined with silicones for a smoother feel.
  • Not considered a penetration enhancer—it stays on the skin's surface.

Common questions

What is Adipic Acid/Methyl DEA Crosspolymer in beauty products?

This ingredient is a man-made polymer that forms a thin, flexible film on your skin. It helps makeup and sunscreen stay in place longer and resist water and sweat. Think of it like a clear, breathable shield that keeps your product from sliding off. It doesn't moisturize or treat your skin—it's purely a texture and performance helper.

What does Adipic Acid/Methyl DEA Crosspolymer do in a beauty product?

When applied, the polymer molecules link together to create a continuous, water-resistant film on the skin's surface. This film helps other ingredients adhere better, reduces transfer, and improves the longevity of the product.

Is Adipic Acid/Methyl DEA Crosspolymer safe for most people?

Considered safe for topical use at typical concentrations. Low irritation and comedogenic risk. No known systemic toxicity from cosmetic use.

Who should be careful with Adipic Acid/Methyl DEA Crosspolymer?

Individuals with very dry or dehydrated skin who prioritize hydration over wear time Those who prefer minimal-ingredient or all-natural formulations

Research sources

Cosmetic Ingredient Review (CIR) - Safety Assessment of Crosslinked PolymersOpenPubChem - Adipic AcidOpenEuropean Chemicals Agency (ECHA) - Adipic Acid/Methyl DEA CrosspolymerOpen

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.