Ingredient review
PEG-45/Dodecyl Glycol Copolymer
INCI: PEG-45/Dodecyl Glycol Copolymer
A synthetic polymer that helps products stay put, resist water, and feel smooth, but offers no active skincare benefit.
In plain English
PEG-45/Dodecyl Glycol Copolymer is a man-made ingredient that forms a thin, flexible film on your skin. Think of it like a clear, invisible shield that helps makeup or sunscreen stay in place longer, even when you sweat or get wet. It also makes the product feel silky and spread easily. It doesn't treat or change your skin—it's purely a performance booster for the formula.
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
PEG-45/Dodecyl Glycol 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 PEG-45/Dodecyl Glycol 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 synthetic copolymer made by reacting polyethylene glycol (PEG) with dodecyl glycol. It belongs to a class of ingredients called film formers, which create a continuous layer on the skin.
How it works
When applied, the copolymer molecules link together to form a thin, flexible film on the skin's surface. This film locks in other ingredients, resists water and friction, and gives a smooth, even finish. It also helps control the thickness and spreadability of the product.
Pros
Boosts wear time
Helps makeup and sunscreen resist sweat, water, and rubbing, so you need fewer touch-ups throughout the day.
Improves texture
Gives products a silky, smooth feel that glides on easily and dries down to a non-sticky finish.
Cons and cautions
No skin benefit
This ingredient is purely functional—it doesn't hydrate, soothe, or repair the skin, so it adds no active value.
Potential tightness
On very dry or compromised skin, the film can feel slightly tight or uncomfortable, especially if layered under heavy products.
Best for
- People who want long-wearing, water-resistant makeup or sunscreen
- Those with normal to oily skin who prefer a matte, stay-put finish
Use caution if
- Individuals with very dry or dehydrated skin who may find film formers uncomfortable
- Anyone strictly avoiding synthetic or PEG-based ingredients
Usage tips
Safety summary
PEG-45/Dodecyl Glycol Copolymer is considered safe for topical use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. However, individuals with very sensitive or dry skin may experience mild tightness. Always remove thoroughly at the end of the day.
Research notes
Safety assessments by the Cosmetic Ingredient Review (CIR) panel have concluded that PEG-based polymers are safe in cosmetics when formulated to meet purity standards. Specific studies on this copolymer are limited, but its class is well-established as low-risk.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and many other regions. The PEG component is purified to meet safety standards for cosmetic use.
- Common uses
- Sunscreens, Waterproof makeup, Long-wear foundations, Eye liners
- Environmental note
- As a synthetic polymer, it is not biodegradable. Its environmental impact in water systems is still being studied, though it is used in low concentrations.
Good to know
- PEG-45/Dodecyl Glycol Copolymer is often found in 'waterproof' or 'long-wear' labeled products.
- It is considered safe for use in cosmetics by major regulatory bodies when used as intended.
Common questions
What is PEG-45/Dodecyl Glycol Copolymer in beauty products?
PEG-45/Dodecyl Glycol Copolymer is a man-made ingredient that forms a thin, flexible film on your skin. Think of it like a clear, invisible shield that helps makeup or sunscreen stay in place longer, even when you sweat or get wet. It also makes the product feel silky and spread easily. It doesn't treat or change your skin—it's purely a performance booster for the formula.
What does PEG-45/Dodecyl Glycol Copolymer do in a beauty product?
When applied, the copolymer molecules link together to form a thin, flexible film on the skin's surface. This film locks in other ingredients, resists water and friction, and gives a smooth, even finish. It also helps control the thickness and spreadability of the product.
Is PEG-45/Dodecyl Glycol Copolymer safe for most people?
PEG-45/Dodecyl Glycol Copolymer is considered safe for topical use in cosmetics at typical concentrations. It has low irritation and comedogenic potential. However, individuals with very sensitive or dry skin may experience mild tightness. Always remove thoroughly at the end of the day.
Who should be careful with PEG-45/Dodecyl Glycol Copolymer?
Individuals with very dry or dehydrated skin who may find film formers uncomfortable Anyone strictly avoiding synthetic or PEG-based 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.