Ingredient review
Corn Starch Acrylate Copolymer
INCI: CORN STARCH/ACRYLAMIDE/SODIUM ACRYLATE COPOLYMER
A gentle, effective thickener that gives products a silky, non-sticky feel while helping to stabilize emulsions.
In plain English
This ingredient is a hybrid of natural corn starch and synthetic polymers. In your skincare, it acts like a thickening and stabilizing agent, giving creams and lotions a smooth, velvety texture without leaving a heavy or greasy residue. It also helps keep the formula from separating and can create a light, breathable film on the skin.
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
- semi synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Corn Starch Acrylate Copolymer 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 Corn Starch Acrylate Copolymer.
- 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 semi-synthetic copolymer made by grafting acrylamide and sodium acrylate onto corn starch molecules. It is a white, free-flowing powder that swells in water to form a gel-like network.
How it works
When mixed into a water-based formula, the corn starch portion absorbs water and swells, while the synthetic polymer chains link together to create a stable, viscous gel. This thickens the product, prevents oil and water from separating, and leaves a smooth, non-tacky film on the skin after application.
Pros
Silky, non-sticky finish
Creates a smooth, velvety feel on the skin without the tackiness common with other thickeners like gums.
Excellent stabilizer
Helps keep emulsions from separating, which means your product stays consistent and effective from first use to last.
Cons and cautions
Semi-synthetic origin
Contains synthetic polymers, which may not align with all-natural or 'clean beauty' preferences.
Potential slight drying effect
In high concentrations, the film it forms can feel slightly tightening or drying for very dry or dehydrated skin.
Best for
- Anyone who prefers lightweight, non-sticky moisturizers or sunscreens
- People with oily or combination skin looking for a matte finish
Use caution if
- Those strictly avoiding synthetic or semi-synthetic ingredients
Usage tips
Safety summary
Considered safe for topical use in cosmetics at typical concentrations. Low irritation and comedogenic potential. No significant safety concerns have been reported in peer-reviewed literature.
Research notes
Limited direct studies on this specific copolymer, but its components (acrylamide/sodium acrylate copolymers and corn starch) are well-studied and generally recognized as safe in topical applications. The Cosmetic Ingredient Review (CIR) panel has reviewed similar acrylate copolymers and found them safe as used.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics globally, including by the U.S. FDA and EU CosIng database, with no known restrictions.
- Common uses
- Moisturizers, Serums, Sunscreens, Masks, Hair products
- Environmental note
- The synthetic polymer portion is not biodegradable, though the corn starch component is renewable. Overall environmental impact is moderate.
Good to know
- This ingredient is often used to replace synthetic thickeners like Carbomer in more natural-leaning formulas.
- It is considered safe and non-irritating by major regulatory bodies.
Common questions
What is Corn Starch Acrylate Copolymer in beauty products?
This ingredient is a hybrid of natural corn starch and synthetic polymers. In your skincare, it acts like a thickening and stabilizing agent, giving creams and lotions a smooth, velvety texture without leaving a heavy or greasy residue. It also helps keep the formula from separating and can create a light, breathable film on the skin.
What does Corn Starch Acrylate Copolymer do in a beauty product?
When mixed into a water-based formula, the corn starch portion absorbs water and swells, while the synthetic polymer chains link together to create a stable, viscous gel. This thickens the product, prevents oil and water from separating, and leaves a smooth, non-tacky film on the skin after application.
Is Corn Starch Acrylate Copolymer safe for most people?
Considered safe for topical use in cosmetics at typical concentrations. Low irritation and comedogenic potential. No significant safety concerns have been reported in peer-reviewed literature.
Who should be careful with Corn Starch Acrylate Copolymer?
Those strictly avoiding synthetic or semi-synthetic ingredients
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.