Ingredient review

Polybeta-Alanine/Glutaric Acid Crosspolymer

INCI: POLYBETA-ALANINE/GLUTARIC ACID CROSSPOLYMER

A gentle film-forming polymer that improves product texture and wear without clogging pores or irritating skin.

beautyskincarefilm-former

In plain English

This is a man-made ingredient that forms a thin, flexible film on your skin. It helps other ingredients stay put longer and gives products a smooth, silky feel. Think of it like a clear, breathable shield that holds everything together without feeling heavy or sticky.

Review score

Safety, usefulness, and evidence

4.0Good
4.0/ 5

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
How reviews are scored

Quick decision guide

Useful, but context matters

Polybeta-Alanine/Glutaric Acid 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.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Polybeta-Alanine/Glutaric Acid Crosspolymer.
  2. Step 2Use the "Best for" and "Use caution if" sections to match the ingredient to your skin, not just to a marketing claim.
  3. 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

low

Less likely to sting, burn, or bother most users, though sensitive skin can still react.

Clogging risk

low

Less likely to feel heavy or contribute to clogged pores for most skin types.

Evidence level

moderate

There is useful support, but formula details and claim strength still matter.

What it is

A synthetic crosspolymer made from beta-alanine (an amino acid) and glutaric acid (a dicarboxylic acid). It is engineered to create a flexible, water-resistant film on the skin.

How it works

When applied, the polymer chains spread across the skin and link together to form a continuous, invisible film. This film helps lock in moisture, smooth the skin's surface, and improve the wear time of other active ingredients.

Pros

Improves product longevity

The film helps active ingredients and makeup stay on the skin longer, reducing the need for frequent reapplication.

Non-irritating and non-comedogenic

Clinical data and safety reviews indicate a very low risk of irritation or pore-clogging, making it suitable for sensitive and acne-prone skin.

Cons and cautions

Not a moisturizer

It forms a film but does not add hydration. If your skin is very dry, you'll still need a good moisturizer underneath.

May feel tight on very dry skin

The film can create a slight tightening sensation, which some people with dehydrated skin may find uncomfortable.

Best for

  • Anyone looking for longer-lasting makeup or sunscreen
  • People with normal to oily skin who want a smooth, matte finish

Use caution if

  • Those with extremely dry or compromised skin barriers may prefer a more hydrating film-former

Usage tips

Apply to damp skin for a more flexible, less tight film.
Layer over your moisturizer and before sunscreen or makeup for best results.
If you experience tightness, try using a richer moisturizer underneath.

Safety summary

Polybeta-alanine/glutaric acid crosspolymer is considered safe for cosmetic use. It has low irritation and comedogenic potential, and no significant safety concerns have been identified in regulatory reviews.

Research notes

Safety assessments by the Cosmetic Ingredient Review (CIR) panel and other regulatory bodies support its use as a film-former. Studies show it is non-irritating and non-sensitizing at typical concentrations.

Common label clues

Typical concentration
0.5% to 5%
Regulatory status
Approved for use in cosmetics globally. The Cosmetic Ingredient Review (CIR) panel has deemed it safe at typical concentrations.
Common uses
Serums, Moisturizers, Sunscreens, Primers, Masks
Environmental note
Synthetic but biodegradable. No known bioaccumulation concerns at cosmetic use levels.

Good to know

  • This ingredient is often used in 'long-wear' or 'water-resistant' formulas.
  • It is biodegradable and considered safe for the environment at typical cosmetic use levels.

Common questions

What is Polybeta-Alanine/Glutaric Acid Crosspolymer in beauty products?

This is a man-made ingredient that forms a thin, flexible film on your skin. It helps other ingredients stay put longer and gives products a smooth, silky feel. Think of it like a clear, breathable shield that holds everything together without feeling heavy or sticky.

What does Polybeta-Alanine/Glutaric Acid Crosspolymer do in a beauty product?

When applied, the polymer chains spread across the skin and link together to form a continuous, invisible film. This film helps lock in moisture, smooth the skin's surface, and improve the wear time of other active ingredients.

Is Polybeta-Alanine/Glutaric Acid Crosspolymer safe for most people?

Polybeta-alanine/glutaric acid crosspolymer is considered safe for cosmetic use. It has low irritation and comedogenic potential, and no significant safety concerns have been identified in regulatory reviews.

Who should be careful with Polybeta-Alanine/Glutaric Acid Crosspolymer?

Those with extremely dry or compromised skin barriers may prefer a more hydrating film-former

Research sources

Cosmetic Ingredient Review (CIR) Safety AssessmentOpenEuropean Chemicals Agency (ECHA) DatabaseOpenPubMed - Polymer Film-Formers in CosmeticsOpen

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.