Ingredient review
Hyaluronic Acid Crosspolymer
INCI: PEG-9 Diglycidyl Ether/Sodium Hyaluronate Crosspolymer
A more stable, longer-lasting version of hyaluronic acid that clings to the skin's surface for sustained hydration without the sticky feel.
In plain English
This is a souped-up version of hyaluronic acid, a natural substance in your skin that holds water. Think of regular hyaluronic acid as a loose sponge that can drip water away. This crosspolymer version is like a tightly woven sponge that holds onto water more firmly and releases it slowly over time. It sits on top of your skin, creating a smooth, plumping film that helps keep moisture in and feels lightweight.
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
Hyaluronic 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.
- Step 1Start with the score, then check the irritation and clogging risk before judging Hyaluronic Acid 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 chemically modified form of sodium hyaluronate (the salt form of hyaluronic acid). It is crosslinked using a molecule called PEG-9 diglycidyl ether, which links individual hyaluronic acid chains together into a larger, more stable network. This makes the ingredient less water-soluble and more film-forming on the skin.
How it works
When applied to the skin, it forms a thin, flexible, and invisible film. This film acts as a physical barrier that slows down water loss from the skin's surface (transepidermal water loss, or TEWL). At the same time, the crosslinked structure can still attract and hold onto water from the environment or from other product ingredients, providing a sustained hydrating effect that lasts longer than regular hyaluronic acid.
Pros
Longer-lasting hydration
The crosslinked structure holds water more effectively than regular hyaluronic acid, providing sustained moisture throughout the day without needing to reapply.
Smoothing surface effect
It forms a plumping film that can temporarily smooth out fine lines and create a more even skin texture, making it a great base for makeup.
Cons and cautions
Surface-level action only
Because of its large molecular size, this ingredient stays on the outermost layer of the skin and does not penetrate deeply. It hydrates the surface but won't deliver moisture to deeper skin layers.
Potential for pilling
The film it forms can sometimes pill or roll off when layered with other products, especially if applied too quickly or with incompatible ingredients like heavy silicones.
Best for
- People with dry or dehydrated skin looking for a long-lasting moisture boost
- Anyone who likes the feel of hyaluronic acid but wants a more substantial, film-like texture
Use caution if
- Those who prefer very lightweight, watery textures and dislike any film-forming sensation on the skin
Usage tips
Safety summary
Generally recognized as safe for topical use in cosmetics. The crosslinked structure is well-tolerated by most skin types, including sensitive skin. The PEG component is used at low levels and is considered safe, though individuals with known sensitivities to PEGs may want to patch test. There are no significant safety concerns reported in cosmetic use.
Research notes
Research on crosslinked hyaluronic acid focuses on its improved water-holding capacity and film-forming properties compared to linear hyaluronic acid. Studies show it can reduce TEWL and provide longer-lasting surface hydration. However, most evidence comes from ingredient manufacturer data and formulation studies rather than large-scale independent clinical trials.
Common label clues
- Typical concentration
- 0.1% to 1%
- Regulatory status
- Approved for use in cosmetics in the US, EU, and other major markets. The ingredient is not specifically restricted, but the PEG component is subject to purity standards to limit impurities like 1,4-dioxane.
- Common uses
- Serums, Moisturizers, Eye Creams, Sheet Masks
- Environmental note
- The PEG component is synthetic and derived from petroleum. The hyaluronic acid is typically produced via bacterial fermentation, which is a more sustainable process than animal-derived sources.
Good to know
- This ingredient is often found in 'multi-weight hyaluronic acid' serums, where it works alongside smaller HA molecules to hydrate both the surface and deeper layers.
- The 'PEG' part is a crosslinking agent that is generally considered safe at the low levels used in cosmetics, but some consumers prefer PEG-free products.
Common questions
What is Hyaluronic Acid Crosspolymer in beauty products?
This is a souped-up version of hyaluronic acid, a natural substance in your skin that holds water. Think of regular hyaluronic acid as a loose sponge that can drip water away. This crosspolymer version is like a tightly woven sponge that holds onto water more firmly and releases it slowly over time. It sits on top of your skin, creating a smooth, plumping film that helps keep moisture in and feels lightweight.
What does Hyaluronic Acid Crosspolymer do in a beauty product?
When applied to the skin, it forms a thin, flexible, and invisible film. This film acts as a physical barrier that slows down water loss from the skin's surface (transepidermal water loss, or TEWL). At the same time, the crosslinked structure can still attract and hold onto water from the environment or from other product ingredients, providing a sustained hydrating effect that lasts longer than regular hyaluronic acid.
Is Hyaluronic Acid Crosspolymer safe for most people?
Generally recognized as safe for topical use in cosmetics. The crosslinked structure is well-tolerated by most skin types, including sensitive skin. The PEG component is used at low levels and is considered safe, though individuals with known sensitivities to PEGs may want to patch test. There are no significant safety concerns reported in cosmetic use.
Who should be careful with Hyaluronic Acid Crosspolymer?
Those who prefer very lightweight, watery textures and dislike any film-forming sensation on the skin
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.