Ingredient review
Glycidyl Neodecanoate Crosspolymer
INCI: GLYCIDYL NEODECANOATE/PHTHALIC ANHYDRIDE/TMP CROSSPOLYMER
A synthetic polymer that helps products stay put and resist water, but offers no active skincare benefit.
In plain English
This is a man-made ingredient that forms a thin, flexible film on your skin. It's used to make products like sunscreen or foundation last longer and resist water or sweat. Think of it like a clear, breathable seal that helps your makeup stay in place without feeling heavy or sticky.
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
Glycidyl Neodecanoate 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 Glycidyl Neodecanoate 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 synthetic crosspolymer created from glycidyl neodecanoate, phthalic anhydride, and trimethylolpropane (TMP). It is a film-forming agent that dries down to a flexible, water-resistant layer on the skin.
How it works
When applied, the polymer molecules link together to form a continuous film on the skin's surface. This film helps other ingredients (like pigments or UV filters) adhere better and resist being washed away by water or sweat. It also helps control the viscosity (thickness) of the product for a smooth application.
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 fading or creasing throughout the day.
Cons and cautions
No active skincare benefit
This ingredient is purely functional—it doesn't hydrate, soothe, or treat the skin. It's only there for texture and durability.
May feel drying over time
The film can sometimes trap dryness or feel tight on very dry or sensitive skin, especially if used in large amounts.
Best for
- People who want long-wearing or waterproof makeup
- Those who use water-resistant sunscreens for outdoor activities
Use caution if
- Individuals with very dry or dehydrated skin who prefer lightweight, non-film-forming products
Usage tips
Safety summary
Generally recognized as safe for topical use in cosmetics. Low irritation and comedogenic risk. No significant safety concerns at typical concentrations.
Research notes
Limited peer-reviewed studies specifically on this polymer, but crosspolymer film-formers as a class are well-studied for safety and efficacy in cosmetic applications. Regulatory panels (e.g., CIR) have reviewed similar polymers and found them safe.
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, it is not biodegradable. However, it is used in small amounts and is not known to bioaccumulate.
Good to know
- This polymer is often used in combination with other film-formers to achieve a balance of flexibility and durability.
- It is considered safe for use in cosmetics by major regulatory bodies when used as intended.
Common questions
What is Glycidyl Neodecanoate Crosspolymer in beauty products?
This is a man-made ingredient that forms a thin, flexible film on your skin. It's used to make products like sunscreen or foundation last longer and resist water or sweat. Think of it like a clear, breathable seal that helps your makeup stay in place without feeling heavy or sticky.
What does Glycidyl Neodecanoate Crosspolymer do in a beauty product?
When applied, the polymer molecules link together to form a continuous film on the skin's surface. This film helps other ingredients (like pigments or UV filters) adhere better and resist being washed away by water or sweat. It also helps control the viscosity (thickness) of the product for a smooth application.
Is Glycidyl Neodecanoate Crosspolymer safe for most people?
Generally recognized as safe for topical use in cosmetics. Low irritation and comedogenic risk. No significant safety concerns at typical concentrations.
Who should be careful with Glycidyl Neodecanoate Crosspolymer?
Individuals with very dry or dehydrated skin who prefer lightweight, non-film-forming products
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.