Ingredient review
Polyamide-1
INCI: POLYAMIDE-1
Polyamide-1 is a synthetic film-former that helps makeup and hair products resist water and last longer, with a low risk of irritation.
In plain English
Polyamide-1 is a man-made plastic-like ingredient that forms a thin, flexible film on your skin or hair. Think of it like a clear, invisible coat that helps makeup stay put and not smudge, even in humidity or water. It's often used in mascaras and eyeliners to keep them from running, and in hair products to hold styles without stiffness.
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
Polyamide-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 Polyamide-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
Polyamide-1 is a synthetic polymer, specifically a type of nylon, engineered to create a flexible, water-resistant film. It is produced through chemical polymerization and is designed for cosmetic use.
How it works
When applied, Polyamide-1 molecules link together to form a continuous, thin film on the surface of skin or hair. This film acts as a barrier that repels water and oils, helping to lock in the product's pigments or hold a hairstyle. It also adds a slight thickening effect to the product's texture.
Pros
Long-lasting wear
Polyamide-1 helps makeup and hair products resist water, sweat, and humidity, so your look stays fresh longer without smudging or fading.
Flexible film
Unlike some stiff film-formers, Polyamide-1 creates a flexible coating that moves with your skin or hair, preventing a tight or crunchy feel.
Cons and cautions
Removal difficulty
Because it forms a water-resistant film, Polyamide-1 can be stubborn to remove with regular cleansers, often requiring an oil-based or micellar cleanser.
Environmental impact
As a synthetic plastic polymer, Polyamide-1 is not biodegradable and may contribute to microplastic pollution when washed down the drain.
Best for
- Anyone wanting long-wearing, smudge-proof eye makeup
- People with normal to dry skin who want makeup to last through the day
Use caution if
- Those who prefer fully biodegradable or natural formulations
Usage tips
Safety summary
Polyamide-1 has a low irritation and comedogenic risk, making it safe for most skin types, including sensitive skin around the eyes. It is not known to be toxic or allergenic at typical cosmetic concentrations.
Research notes
Safety assessments by the Cosmetic Ingredient Review (CIR) panel have concluded that Polyamide-1 is safe for use in cosmetics when formulated appropriately. Studies focus on its film-forming properties and lack of skin irritation.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics in the US (FDA) and EU (CosIng). No known restrictions at typical concentrations.
- Common uses
- Mascara, Eyeliners, Long-wear foundations, Hair styling products
- Environmental note
- Polyamide-1 is a synthetic polymer and not biodegradable. Its environmental impact is a concern, though it is used in small amounts in rinse-off products.
Good to know
- Polyamide-1 is considered safe for use in cosmetics by major regulatory bodies, including the FDA and the European Commission.
- It is often combined with other film-formers to fine-tune the flexibility and water resistance of the final product.
Common questions
What is Polyamide-1 in beauty products?
Polyamide-1 is a man-made plastic-like ingredient that forms a thin, flexible film on your skin or hair. Think of it like a clear, invisible coat that helps makeup stay put and not smudge, even in humidity or water. It's often used in mascaras and eyeliners to keep them from running, and in hair products to hold styles without stiffness.
What does Polyamide-1 do in a beauty product?
When applied, Polyamide-1 molecules link together to form a continuous, thin film on the surface of skin or hair. This film acts as a barrier that repels water and oils, helping to lock in the product's pigments or hold a hairstyle. It also adds a slight thickening effect to the product's texture.
Is Polyamide-1 safe for most people?
Polyamide-1 has a low irritation and comedogenic risk, making it safe for most skin types, including sensitive skin around the eyes. It is not known to be toxic or allergenic at typical cosmetic concentrations.
Who should be careful with Polyamide-1?
Those who prefer fully biodegradable or natural formulations
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.