Ingredient review
Capryloyl Glycerin/Sebacic Acid Copolymer
INCI: CAPRYLOYL GLYCERIN/SEBACIC ACID COPOLYMER
A gentle, biodegradable film-former that helps lock in moisture and improve water resistance without feeling heavy or sticky.
In plain English
This ingredient is a polymer made from natural fatty acids and sebacic acid (a plant-derived compound). When applied to skin or hair, it dries down into a very thin, flexible film that helps hold in moisture and protect against water loss. It's often used in sunscreens and moisturizers to improve water resistance and in hair products to provide light hold without stiffness.
Review score
Safety, usefulness, and evidence
Strong fit for many routines
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
Quick decision guide
Easy yes for most routines
Capryloyl Glycerin/Sebacic Acid 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 Capryloyl Glycerin/Sebacic Acid 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 semi-synthetic copolymer created by reacting caprylic acid (from coconut or palm oil) with glycerin and sebacic acid (from castor oil). It forms a clear, flexible film that is biodegradable and gentle on skin.
How it works
After application, the copolymer molecules link together as the water evaporates, creating a uniform, breathable film on the skin or hair surface. This film reduces water evaporation (TEWL, or transepidermal water loss) and helps other ingredients stay in place longer. It also improves the water resistance of sunscreens and moisturizers.
Pros
Lightweight moisture barrier
Forms a thin, flexible film that reduces water loss without the heavy, greasy feel of traditional occlusives like petrolatum.
Improves sunscreen performance
Helps sunscreens stay on the skin longer during swimming or sweating, boosting their water-resistance rating.
Cons and cautions
May feel tight on very dry skin
If used in high concentrations without enough humectants, the film can feel slightly tight or dry on already parched skin.
Limited research on long-term use
While generally considered safe, there are fewer peer-reviewed studies on this newer polymer compared to decades-old film-formers.
Best for
- People with normal to dry skin looking for lightweight moisture lock
- Anyone wanting a more water-resistant sunscreen or moisturizer without heavy silicones
Use caution if
- Those with very oily or acne-prone skin may prefer non-film-forming humectants like glycerin
Usage tips
Safety summary
Considered safe for use in cosmetics at typical concentrations. Low irritation and comedogenic potential. No known sensitization or toxicity concerns in published safety assessments.
Research notes
Moderate evidence supports its film-forming and water-resistance benefits. Most data come from manufacturer safety dossiers and a few independent studies. More peer-reviewed research on long-term skin effects would strengthen the evidence base.
Common label clues
- Typical concentration
- 0.5–5% in leave-on products; up to 10% in rinse-off products
- Regulatory status
- Approved for use in cosmetics in the EU, USA, and other major markets. No specific restrictions beyond general cosmetic safety requirements.
- Common uses
- Moisturizers, Sunscreens, Hair styling products, Leave-on treatments, Water-resistant formulations
- Environmental note
- Derived from plant-based caprylic acid and sebacic acid. The polymer is biodegradable, reducing environmental persistence compared to some synthetic alternatives.
Good to know
- This ingredient is often listed near the end of ingredient lists because it's used at low concentrations.
- It is biodegradable and made from renewable plant sources, making it a more eco-friendly choice than some synthetic film-formers.
Common questions
What is Capryloyl Glycerin/Sebacic Acid Copolymer in beauty products?
This ingredient is a polymer made from natural fatty acids and sebacic acid (a plant-derived compound). When applied to skin or hair, it dries down into a very thin, flexible film that helps hold in moisture and protect against water loss. It's often used in sunscreens and moisturizers to improve water resistance and in hair products to provide light hold without stiffness.
What does Capryloyl Glycerin/Sebacic Acid Copolymer do in a beauty product?
After application, the copolymer molecules link together as the water evaporates, creating a uniform, breathable film on the skin or hair surface. This film reduces water evaporation (TEWL, or transepidermal water loss) and helps other ingredients stay in place longer. It also improves the water resistance of sunscreens and moisturizers.
Is Capryloyl Glycerin/Sebacic Acid Copolymer safe for most people?
Considered safe for use in cosmetics at typical concentrations. Low irritation and comedogenic potential. No known sensitization or toxicity concerns in published safety assessments.
Who should be careful with Capryloyl Glycerin/Sebacic Acid Copolymer?
Those with very oily or acne-prone skin may prefer non-film-forming humectants like glycerin
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.