Ingredient review

Sesame Oil/Succinic Acid/Triricinolein Copolymer

INCI: SESAME OIL/SUCCINIC ACID/TRIRICINOLEIN COPOLYMER

A gentle film-forming polymer that helps makeup and sunscreen stay put without feeling heavy or greasy.

beautyskincarefilm-former

In plain English

This ingredient is a special type of polymer—a long chain of molecules—made by combining sesame oil, succinic acid (a natural acid found in amber), and triricinolein (a component of castor oil). In skincare and makeup, it creates a thin, flexible film on the skin that helps products resist water, sweat, and smudging. Think of it like a clear, invisible shield that keeps your foundation or sunscreen in place longer. It's not a moisturizer or active treatment, but a texture and performance enhancer.

Review score

Safety, usefulness, and evidence

3.8Good
3.8/ 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
semi synthetic
Evidence
moderate
Irritation
low
Clogging risk
low
How reviews are scored

Quick decision guide

Useful, but context matters

Sesame Oil/Succinic Acid/Triricinolein 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.

  1. Step 1Start with the score, then check the irritation and clogging risk before judging Sesame Oil/Succinic Acid/Triricinolein Copolymer.
  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 semi-synthetic copolymer created by chemically linking sesame oil, succinic acid, and triricinolein. The result is a film-forming agent that is biodegradable and derived partly from renewable plant sources.

How it works

When applied to the skin, the copolymer molecules align to form a continuous, flexible film. This film acts as a barrier that reduces the transfer of product to clothing or other surfaces and improves resistance to water and perspiration. It also helps control the viscosity (thickness) of the product, making it easier to apply evenly.

Pros

Enhances product longevity

Helps makeup and sunscreen stay on longer, reducing the need for frequent touch-ups or reapplication.

Lightweight feel

Unlike some older film formers, this copolymer creates a flexible film that doesn't feel stiff or heavy on the skin.

Cons and cautions

Limited safety data

While generally considered safe, there are fewer long-term studies on this specific copolymer compared to more common film formers.

Potential allergen risk

Derived from sesame and castor oils, it may trigger reactions in people with allergies to these ingredients, though rare.

Best for

  • People who want long-lasting makeup or water-resistant sunscreen
  • Those with normal to oily skin who prefer a matte or transfer-resistant finish

Use caution if

  • Individuals with a known allergy to sesame or castor oil derivatives

Usage tips

Look for this ingredient in long-wear foundations, eyeliners, and water-resistant sunscreens for best results.
If you have sensitive skin, patch test a product containing this copolymer before full-face application.

Safety summary

Generally recognized as safe for topical use in cosmetics at typical concentrations. Low irritation and comedogenic potential. However, individuals with sesame or castor oil allergies should exercise caution.

Research notes

Limited peer-reviewed studies exist specifically on this copolymer, but its components (sesame oil, succinic acid, triricinolein) are well-studied and considered safe. The polymer's film-forming properties are supported by cosmetic chemistry principles and industry use.

Common label clues

Typical concentration
1% to 5%
Regulatory status
Approved for use in cosmetics in the EU, US, and other major markets. No specific restrictions beyond general cosmetic safety requirements.
Common uses
Long-wear makeup, Sunscreens, Water-resistant formulations
Environmental note
Partially derived from renewable plant sources (sesame and castor oils) and reported to be biodegradable, reducing its environmental persistence.

Good to know

  • This copolymer is biodegradable, making it a more environmentally friendly option compared to some synthetic film formers.
  • It is often used in combination with other film formers to achieve the right balance of flexibility and durability.

Common questions

What is Sesame Oil/Succinic Acid/Triricinolein Copolymer in beauty products?

This ingredient is a special type of polymer—a long chain of molecules—made by combining sesame oil, succinic acid (a natural acid found in amber), and triricinolein (a component of castor oil). In skincare and makeup, it creates a thin, flexible film on the skin that helps products resist water, sweat, and smudging. Think of it like a clear, invisible shield that keeps your foundation or sunscreen in place longer. It's not a moisturizer or active treatment, but a texture and performance enhancer.

What does Sesame Oil/Succinic Acid/Triricinolein Copolymer do in a beauty product?

When applied to the skin, the copolymer molecules align to form a continuous, flexible film. This film acts as a barrier that reduces the transfer of product to clothing or other surfaces and improves resistance to water and perspiration. It also helps control the viscosity (thickness) of the product, making it easier to apply evenly.

Is Sesame Oil/Succinic Acid/Triricinolein Copolymer safe for most people?

Generally recognized as safe for topical use in cosmetics at typical concentrations. Low irritation and comedogenic potential. However, individuals with sesame or castor oil allergies should exercise caution.

Who should be careful with Sesame Oil/Succinic Acid/Triricinolein Copolymer?

Individuals with a known allergy to sesame or castor oil derivatives

Research sources

CosIng - European Commission DatabaseOpenPubChem - Succinic AcidOpenEnvironmental Working Group - Ingredient SafetyOpen

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.