Ingredient review
Calcium Polyglutamate Crosspolymer
INCI: Calcium Polyglutamate Crosspolymer
A next-generation humectant that forms a flexible, breathable film to lock in moisture without the stickiness of traditional hyaluronic acid.
In plain English
Calcium Polyglutamate Crosspolymer is a modern, lab-made version of polyglutamic acid (PGA). It's a long chain of amino acids that has been crosslinked (chemically linked together) to create a larger, more stable molecule. When applied to the skin, it forms a thin, flexible, invisible film that holds onto water and slowly releases it, keeping your skin hydrated for longer. Unlike some other humectants, it doesn't feel tacky or heavy, and it's designed to work well even in low-humidity environments.
Review score
Safety, usefulness, and evidence
Potentially useful with some tradeoffs
The evidence base is still emerging, so marketing claims deserve extra caution.
Risk flags are low for most users, though the finished product can still irritate.
- Source
- biotech
- Evidence
- emerging
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Useful, but context matters
Calcium Polyglutamate 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 Calcium Polyglutamate 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
emergingThe ingredient may be promising, but claims should be treated more cautiously.
What it is
A biotechnologically produced, crosslinked polymer of the amino acid glutamic acid. It is a larger, more stable version of polyglutamic acid, designed to enhance water-binding and film-forming properties on the skin.
How it works
It forms a flexible, breathable film on the skin's surface that physically traps water molecules. This film reduces water loss (transepidermal water loss, or TEWL) and slowly releases moisture back into the skin over time. Its crosslinked structure makes it more resistant to breakdown by enzymes on the skin, providing longer-lasting hydration compared to non-crosslinked polyglutamic acid.
Pros
Lasting hydration
Its crosslinked structure helps it hold onto water longer than many standard humectants, so your skin stays hydrated for hours after application.
Comfortable feel
Unlike some film-formers, it dries down to a soft, flexible finish that doesn't feel tight or stiff, making it pleasant to wear under makeup or sunscreen.
Cons and cautions
Emerging evidence
While promising, the ingredient has fewer published human studies than well-established humectants like hyaluronic acid, so its long-term benefits are still being explored.
Potential tackiness
If used in very high concentrations or layered with other heavy products, it can leave a slightly tacky residue that some users may not enjoy.
Best for
- Anyone with dry or dehydrated skin looking for a powerful humectant
- People who find hyaluronic acid too sticky or ineffective in dry climates
Use caution if
- Those with extremely sensitive skin who react to fermented or biotech ingredients (rare)
Usage tips
Safety summary
Calcium Polyglutamate Crosspolymer is considered safe for cosmetic use. It has a low irritation and comedogenic risk, and no significant safety concerns have been reported in available studies or regulatory reviews.
Research notes
Research on this specific crosspolymer is still emerging. Early studies and manufacturer data suggest it provides superior water-binding capacity and film flexibility compared to standard polyglutamic acid. More independent, peer-reviewed human trials are needed to fully confirm its long-term efficacy.
Common label clues
- Typical concentration
- 0.1% to 1%
- Regulatory status
- Approved for use in cosmetics in the EU, US, and most major markets. No specific restrictions beyond general cosmetic safety requirements.
- Common uses
- Serums, Moisturizers, Sheet masks, Eye creams
- Environmental note
- Produced through biotechnological fermentation, which typically has a lower environmental footprint than petroleum-based film formers. It is biodegradable.
Good to know
- It is often produced via fermentation, making it a biotech ingredient.
- It is vegan-friendly and generally considered sustainable to produce.
- It can be combined with hyaluronic acid for a multi-layered hydration boost.
Common questions
What is Calcium Polyglutamate Crosspolymer in beauty products?
Calcium Polyglutamate Crosspolymer is a modern, lab-made version of polyglutamic acid (PGA). It's a long chain of amino acids that has been crosslinked (chemically linked together) to create a larger, more stable molecule. When applied to the skin, it forms a thin, flexible, invisible film that holds onto water and slowly releases it, keeping your skin hydrated for longer. Unlike some other humectants, it doesn't feel tacky or heavy, and it's designed to work well even in low-humidity environments.
What does Calcium Polyglutamate Crosspolymer do in a beauty product?
It forms a flexible, breathable film on the skin's surface that physically traps water molecules. This film reduces water loss (transepidermal water loss, or TEWL) and slowly releases moisture back into the skin over time. Its crosslinked structure makes it more resistant to breakdown by enzymes on the skin, providing longer-lasting hydration compared to non-crosslinked polyglutamic acid.
Is Calcium Polyglutamate Crosspolymer safe for most people?
Calcium Polyglutamate Crosspolymer is considered safe for cosmetic use. It has a low irritation and comedogenic risk, and no significant safety concerns have been reported in available studies or regulatory reviews.
Who should be careful with Calcium Polyglutamate Crosspolymer?
Those with extremely sensitive skin who react to fermented or biotech ingredients (rare)
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.