Ingredient review
Dimethicone/Aminopropyl Silsesquioxane Copolymer
INCI: Dimethicone/Aminopropyl Silsesquioxane Copolymer
A gentle silicone polymer that helps makeup and hair products last longer without feeling heavy or greasy.
In plain English
This is a silicone-based ingredient that forms a thin, flexible film on your skin or hair. Think of it like a clear, breathable shield that helps your makeup stay put or your hairstyle hold its shape. It's not oily or sticky, and it washes off easily with regular cleansers or shampoo.
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
Dimethicone/Aminopropyl Silsesquioxane 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 Dimethicone/Aminopropyl Silsesquioxane 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 from dimethicone (a common silicone) and aminopropyl silsesquioxane (a silicone resin). It is designed to create a flexible, water-resistant film on the surface of skin or hair.
How it works
When applied, the copolymer spreads into a thin, even layer that dries down to a flexible film. This film helps lock in other ingredients, resist sweat and humidity, and keep makeup or hair products in place for longer. It also gives a smooth, silky feel without clogging pores.
Pros
Long-lasting wear
Helps makeup and hair products resist fading, smudging, and humidity, so you need fewer touch-ups throughout the day.
Lightweight feel
Unlike some heavy waxes or oils, this copolymer creates a flexible film that feels weightless and non-sticky on skin and hair.
Cons and cautions
Silicone-based
If you avoid silicones for personal or environmental reasons, this ingredient won't fit your routine.
Potential buildup
On hair, repeated use without clarifying shampoo can lead to a dull or heavy feel over time.
Best for
- Anyone looking for long-lasting makeup or hair hold
- People with oily or combination skin who want a matte finish
Use caution if
- Those who prefer silicone-free or minimalist ingredient lists
Usage tips
Safety summary
This silicone copolymer has a strong safety profile with very low irritation and allergy potential. It is non-comedogenic and widely used in cosmetics for sensitive skin. No significant safety concerns have been raised by regulatory bodies.
Research notes
While not extensively studied in isolation, the ingredient is part of a class of silicone film-formers that have been reviewed by the Cosmetic Ingredient Review (CIR) panel and found safe for use in cosmetics at typical concentrations.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the US, EU, and other major markets. No specific restrictions beyond general cosmetic safety requirements.
- Common uses
- Long-wear makeup, Hair styling products, Sunscreens, Primers
- Environmental note
- As a silicone-based polymer, it may not be biodegradable. However, it is used in small amounts and is not known to accumulate in the environment at concerning levels.
Good to know
- This ingredient is often found in 'long-wear' or '24-hour' makeup formulas.
- It is considered safe for most skin types, including sensitive skin.
Common questions
What is Dimethicone/Aminopropyl Silsesquioxane Copolymer in beauty products?
This is a silicone-based ingredient that forms a thin, flexible film on your skin or hair. Think of it like a clear, breathable shield that helps your makeup stay put or your hairstyle hold its shape. It's not oily or sticky, and it washes off easily with regular cleansers or shampoo.
What does Dimethicone/Aminopropyl Silsesquioxane Copolymer do in a beauty product?
When applied, the copolymer spreads into a thin, even layer that dries down to a flexible film. This film helps lock in other ingredients, resist sweat and humidity, and keep makeup or hair products in place for longer. It also gives a smooth, silky feel without clogging pores.
Is Dimethicone/Aminopropyl Silsesquioxane Copolymer safe for most people?
This silicone copolymer has a strong safety profile with very low irritation and allergy potential. It is non-comedogenic and widely used in cosmetics for sensitive skin. No significant safety concerns have been raised by regulatory bodies.
Who should be careful with Dimethicone/Aminopropyl Silsesquioxane Copolymer?
Those who prefer silicone-free or minimalist ingredient lists
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.