Ingredient review
Polymethacrylic Acid Crosspolymer
INCI: POLYMETHACRYLIC ACID CROSSPOLYMER
A safe, synthetic thickener that gives products a smooth, non-sticky feel without clogging pores.
In plain English
Polymethacrylic acid crosspolymer is a synthetic ingredient that helps skincare products feel smooth and lightweight. It thickens formulas so they spread easily and don't drip, and it can also help other ingredients stay on your skin longer. Think of it as a helper that makes your lotion or gel feel nice and work better.
Review score
Safety, usefulness, and evidence
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
Quick decision guide
Useful, but context matters
Polymethacrylic Acid 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.
- Step 1Start with the score, then check the irritation and clogging risk before judging Polymethacrylic Acid Crosspolymer.
- Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
- 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
lowLess likely to sting, burn, or bother most users, though sensitive skin can still react.
Clogging risk
lowLess likely to feel heavy or contribute to clogged pores for most skin types.
Evidence level
moderateThere is useful support, but formula details and claim strength still matter.
What it is
A high-molecular-weight synthetic polymer made from methacrylic acid units that are crosslinked to form a network. It is produced in a lab and is not found in nature.
How it works
When added to water, the polymer particles swell and create a gel-like network. This increases the product's viscosity (thickness) and helps suspend other ingredients evenly. It also forms a thin, flexible film on the skin that can improve the wear time of ingredients like sunscreen or makeup.
Pros
Lightweight feel
Provides a silky, non-sticky finish that works well in gels and serums, especially for oily or acne-prone skin.
Stabilizes formulas
Helps keep ingredients like sunscreen actives or pigments evenly dispersed, so the product stays effective and consistent.
Cons and cautions
Synthetic source
Made from petroleum-derived materials, which may be a concern for those seeking fully natural or biodegradable products.
Potential tightness
On very dry or sensitive skin, the film-forming effect can sometimes feel slightly drying or tight after application.
Best for
- Anyone who prefers lightweight, gel-based skincare
- People with oily or combination skin who dislike heavy creams
Use caution if
- Those with extremely dry or compromised skin barriers may prefer richer emollients
Usage tips
Safety summary
Polymethacrylic acid crosspolymer is considered safe for topical use. It has low irritation and allergy potential, and is not absorbed through the skin. The Cosmetic Ingredient Review (CIR) panel has reviewed similar polymers and found them safe as used.
Research notes
While specific studies on this exact crosspolymer are limited, the broader class of methacrylic acid polymers has been evaluated for safety in cosmetics. They are generally recognized as safe for topical application with no significant toxicity or sensitization concerns.
Common label clues
- Typical concentration
- 0.1% to 2%
- Regulatory status
- Approved for use in cosmetics globally, including by the U.S. FDA and EU CosIng database, with no known restrictions at typical use levels.
- Common uses
- Gels, Serums, Creams, Sunscreens, Makeup
- Environmental note
- As a synthetic polymer, it is not biodegradable. However, it is used in very small amounts and is not known to accumulate in the environment at concerning levels.
Good to know
- Polymethacrylic acid crosspolymer is often used in 'water-free' gel formulas because it can thicken without needing oil.
- It is considered non-comedogenic and safe for most skin types.
Common questions
What is Polymethacrylic Acid Crosspolymer in beauty products?
Polymethacrylic acid crosspolymer is a synthetic ingredient that helps skincare products feel smooth and lightweight. It thickens formulas so they spread easily and don't drip, and it can also help other ingredients stay on your skin longer. Think of it as a helper that makes your lotion or gel feel nice and work better.
What does Polymethacrylic Acid Crosspolymer do in a beauty product?
When added to water, the polymer particles swell and create a gel-like network. This increases the product's viscosity (thickness) and helps suspend other ingredients evenly. It also forms a thin, flexible film on the skin that can improve the wear time of ingredients like sunscreen or makeup.
Is Polymethacrylic Acid Crosspolymer safe for most people?
Polymethacrylic acid crosspolymer is considered safe for topical use. It has low irritation and allergy potential, and is not absorbed through the skin. The Cosmetic Ingredient Review (CIR) panel has reviewed similar polymers and found them safe as used.
Who should be careful with Polymethacrylic Acid Crosspolymer?
Those with extremely dry or compromised skin barriers may prefer richer emollients
Research sources
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.