Ingredient review
Polyglyceryl Shea Butter Crosspolymer
INCI: Polyglyceryl-10/Sebacic Acid/Shea Butter Crosspolymer
A gentle, plant-based film former that gives products a silky, non-greasy finish and helps ingredients stay put without clogging pores.
In plain English
This ingredient is a cleverly engineered polymer made from shea butter fatty acids and natural glycerin. It forms a thin, flexible film on your skin that feels smooth and velvety, not sticky or tight. Think of it like a lightweight, invisible glove that helps your moisturizer or sunscreen stay in place longer and feel nicer to the touch. Because it's derived from shea butter and glycerin, it's very gentle and unlikely to irritate even sensitive skin.
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
- semi synthetic
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Polyglyceryl Shea Butter 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.
- Step 1Start with the score, then check the irritation and clogging risk before judging Polyglyceryl Shea Butter Crosspolymer.
- 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 crosslinked polymer created by reacting polyglyceryl-10 (a plant-derived emulsifier) with sebacic acid (a natural dicarboxylic acid) and shea butter fatty acids. The result is a biodegradable, high-molecular-weight film former that is water-dispersible and compatible with many cosmetic formulations.
How it works
When applied to skin, the polymer chains spread out and link together to form a continuous, breathable film. This film smooths out the skin's surface, reduces water loss (TEWL, or transepidermal water loss — the amount of water that evaporates from your skin), and helps other ingredients like sunscreen actives or moisturizers adhere more evenly and last longer. It also imparts a soft-focus effect by scattering light, making fine lines less noticeable.
Pros
Gentle and plant-derived
Made from shea butter and glycerin, this polymer is biodegradable and has a very low irritation potential, making it suitable for sensitive skin.
Improves product feel and wear
It gives a velvety, non-tacky finish and helps sunscreen or makeup stay put longer, so you get better protection and a smoother look.
Cons and cautions
Not a standalone moisturizer
It forms a film but doesn't add hydration or oil to the skin. If your skin is very dry, you'll still need a good moisturizer underneath.
Can feel tight in high amounts
In formulas with a high concentration of this polymer, some people may notice a slight tightening sensation as the film dries.
Best for
- Anyone who wants a non-greasy, smooth finish from their moisturizer or sunscreen
- People with oily or combination skin who dislike heavy, sticky textures
Use caution if
- Those with very dry or dehydrated skin may prefer a richer emollient over a film former
Usage tips
Safety summary
Polyglyceryl-10/Sebacic Acid/Shea Butter Crosspolymer is considered safe for use in cosmetics. It has low irritation and comedogenic potential, and is biodegradable. No significant safety concerns have been reported in the scientific literature.
Research notes
While specific studies on this exact crosspolymer are limited, the individual components (polyglyceryl-10, sebacic acid, shea butter) are well-studied and recognized as safe. The polymer's film-forming and texture-enhancing properties are supported by formulation science and industry use.
Common label clues
- Typical concentration
- 0.5% to 5%
- Regulatory status
- Approved for use in cosmetics globally, including the EU, US, and Japan. No known restrictions at typical use levels.
- Common uses
- Moisturizers, Sunscreens, Makeup primers, Hair styling products
- Environmental note
- Biodegradable and derived from renewable plant sources (shea butter and glycerin). It does not contribute to microplastic pollution.
Good to know
- This ingredient is often used in 'clean' or 'green' beauty products because it is biodegradable and derived from renewable sources.
- It is compatible with both water-based and oil-based formulas, making it versatile for many product types.
Common questions
What is Polyglyceryl Shea Butter Crosspolymer in beauty products?
This ingredient is a cleverly engineered polymer made from shea butter fatty acids and natural glycerin. It forms a thin, flexible film on your skin that feels smooth and velvety, not sticky or tight. Think of it like a lightweight, invisible glove that helps your moisturizer or sunscreen stay in place longer and feel nicer to the touch. Because it's derived from shea butter and glycerin, it's very gentle and unlikely to irritate even sensitive skin.
What does Polyglyceryl Shea Butter Crosspolymer do in a beauty product?
When applied to skin, the polymer chains spread out and link together to form a continuous, breathable film. This film smooths out the skin's surface, reduces water loss (TEWL, or transepidermal water loss — the amount of water that evaporates from your skin), and helps other ingredients like sunscreen actives or moisturizers adhere more evenly and last longer. It also imparts a soft-focus effect by scattering light, making fine lines less noticeable.
Is Polyglyceryl Shea Butter Crosspolymer safe for most people?
Polyglyceryl-10/Sebacic Acid/Shea Butter Crosspolymer is considered safe for use in cosmetics. It has low irritation and comedogenic potential, and is biodegradable. No significant safety concerns have been reported in the scientific literature.
Who should be careful with Polyglyceryl Shea Butter Crosspolymer?
Those with very dry or dehydrated skin may prefer a richer emollient over a film former
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.