Ingredient review
Hydroxyethyldiethonium Polyisobutenyl Triethylaminosuccinate
INCI: Hydroxyethyldiethonium Polyisobutenyl Triethylaminosuccinate
A synthetic film-former that helps products stay put and resist water, but offers no active skincare benefit.
In plain English
This is a man-made ingredient that creates a thin, flexible film on your skin. It's mainly used to make sunscreens and makeup more water-resistant and long-lasting. Think of it like a clear, breathable raincoat for your skin—it helps the product 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
Hydroxyethyldiethonium Polyisobutenyl Triethylaminosuccinate 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 Hydroxyethyldiethonium Polyisobutenyl Triethylaminosuccinate.
- 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 derived from polyisobutene, modified with quaternary ammonium and succinate groups. It is designed to form a uniform, flexible film on the skin or hair.
How it works
When applied, the ingredient spreads into a thin, even layer that dries to form a water-resistant barrier. This barrier helps lock in other ingredients (like sunscreen filters or pigments) and prevents them from being easily washed or rubbed off.
Pros
Boosts water resistance
Helps sunscreens and makeup stay effective even when you sweat or swim, reducing the need for frequent reapplication.
Improves wear time
Creates a flexible film that keeps foundation and eye makeup from fading or smudging throughout the day.
Cons and cautions
No active skincare benefit
This ingredient is purely functional—it doesn't hydrate, soothe, or treat skin conditions, so it adds no direct skin health value.
May feel heavy on oily skin
The film-forming nature can sometimes feel tacky or occlusive, which might not be comfortable for those with very oily or acne-prone skin.
Best for
- People who need long-wearing, water-resistant sunscreen or makeup
- Those with normal to dry skin who want a protective film
Use caution if
- People with very oily or acne-prone 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 potential. No significant safety concerns reported in the scientific literature.
Research notes
Limited peer-reviewed studies specifically on this ingredient. Its safety is inferred from similar film-forming polymers and long history of use in cosmetics. No known toxicity or sensitization issues.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and other major markets. No known restrictions at typical usage levels.
- Common uses
- Sunscreens, Waterproof makeup, Long-wear foundations
- Environmental note
- As a synthetic polymer, it may not be biodegradable. However, its environmental impact is not well-studied. Some brands are moving toward more eco-friendly film-formers.
Good to know
- This ingredient is often found in combination with other film-formers and silicones for a more comfortable feel.
- It is considered safe for use in cosmetics by major regulatory bodies at typical concentrations.
Common questions
What is Hydroxyethyldiethonium Polyisobutenyl Triethylaminosuccinate in beauty products?
This is a man-made ingredient that creates a thin, flexible film on your skin. It's mainly used to make sunscreens and makeup more water-resistant and long-lasting. Think of it like a clear, breathable raincoat for your skin—it helps the product stay in place without feeling heavy or sticky.
What does Hydroxyethyldiethonium Polyisobutenyl Triethylaminosuccinate do in a beauty product?
When applied, the ingredient spreads into a thin, even layer that dries to form a water-resistant barrier. This barrier helps lock in other ingredients (like sunscreen filters or pigments) and prevents them from being easily washed or rubbed off.
Is Hydroxyethyldiethonium Polyisobutenyl Triethylaminosuccinate safe for most people?
Generally recognized as safe for topical use in cosmetics. Low irritation and comedogenic potential. No significant safety concerns reported in the scientific literature.
Who should be careful with Hydroxyethyldiethonium Polyisobutenyl Triethylaminosuccinate?
People with very oily or acne-prone 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.