Ingredient review
Polyalkylaminoester-1
INCI: Polyalkylaminoester-1
A synthetic polymer that helps products stay put longer, especially in water-resistant sunscreens and long-wear makeup.
In plain English
Polyalkylaminoester-1 is a man-made ingredient that forms a thin, flexible film on your skin. This film helps other ingredients—like sunscreen actives or pigments—stay in place longer, even when you sweat or go swimming. Think of it as a gentle, invisible glue that helps your makeup or sunscreen last through the day.
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
Polyalkylaminoester-1 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 Polyalkylaminoester-1.
- 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 synthetic polymer (a large molecule made of repeating units) designed to create a water-resistant film on the skin. It is commonly used in sunscreens and long-wear cosmetics.
How it works
When applied, the polymer molecules spread across the skin and link together to form a continuous, flexible film. This film physically locks in other ingredients, reducing their transfer to clothing or wash-off by water. It also helps control the thickness and feel of the product.
Pros
Boosts water resistance
Helps sunscreens and makeup stay effective even when you sweat or swim, so you don't have to reapply as often.
Improves wear time
Creates a flexible film that keeps foundation and eye makeup from smudging or fading throughout the day.
Cons and cautions
Synthetic origin
Made from petrochemicals, which may be a concern for those seeking natural or plant-based skincare.
Limited long-term data
While generally considered safe, there is less independent research on this specific polymer compared to older film-formers.
Best for
- People who need long-lasting, water-resistant sunscreens
- Those who want makeup that stays put through sweat or humidity
Use caution if
- Individuals with very sensitive or reactive skin who prefer minimal synthetic ingredients
Usage tips
Safety summary
Polyalkylaminoester-1 is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. However, as a synthetic polymer, its environmental impact is a consideration.
Research notes
Safety assessments by industry panels (e.g., CIR) have reviewed similar film-forming polymers and found them safe for topical use. Specific studies on Polyalkylaminoester-1 are limited, but its chemical class is well-tolerated.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the US (FDA) and EU (CosIng) with no known restrictions at typical concentrations.
- Common uses
- Sunscreens, Waterproof makeup, Long-wear foundations
- Environmental note
- As a synthetic polymer, its biodegradability is limited. It may contribute to microplastic concerns if washed into waterways.
Good to know
- Polyalkylaminoester-1 is often listed near the end of ingredient lists because it is used in small amounts.
- It is not a sunscreen active ingredient—it only helps the sunscreen stay on your skin longer.
Common questions
What is Polyalkylaminoester-1 in beauty products?
Polyalkylaminoester-1 is a man-made ingredient that forms a thin, flexible film on your skin. This film helps other ingredients—like sunscreen actives or pigments—stay in place longer, even when you sweat or go swimming. Think of it as a gentle, invisible glue that helps your makeup or sunscreen last through the day.
What does Polyalkylaminoester-1 do in a beauty product?
When applied, the polymer molecules spread across the skin and link together to form a continuous, flexible film. This film physically locks in other ingredients, reducing their transfer to clothing or wash-off by water. It also helps control the thickness and feel of the product.
Is Polyalkylaminoester-1 safe for most people?
Polyalkylaminoester-1 is considered safe for use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. However, as a synthetic polymer, its environmental impact is a consideration.
Who should be careful with Polyalkylaminoester-1?
Individuals with very sensitive or reactive skin who prefer minimal 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.