Ingredient review
PNA (Polyglutamic Acid)
INCI: Polyglutamic Acid
PNA is a next-generation humectant that can hold up to 4,000 times its weight in water, making it a standout hydrator for dry or dehydrated skin.
In plain English
PNA, or Polyglutamic Acid, is a natural molecule made from fermented soybeans. It acts like a sponge on your skin, pulling in and holding onto water far more effectively than hyaluronic acid. This helps keep your skin feeling soft, smooth, and plump without being sticky or heavy.
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
- biotech
- Evidence
- moderate
- Irritation
- low
- Clogging risk
- low
Quick decision guide
Easy yes for most routines
PNA (Polyglutamic Acid) 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 PNA (Polyglutamic Acid).
- 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
PNA (Polyglutamic Acid) is a biodegradable polymer produced by fermentation of Bacillus subtilis (a type of good bacteria). It is a chain of glutamic acid amino acids and is known for its exceptional water-binding capacity.
How it works
When applied to the skin, PNA forms a thin, flexible film that traps moisture. It prevents water loss by creating a barrier that slows evaporation, while also drawing water from the environment into the outer layers of the skin. This dual action boosts hydration and supports a healthy skin barrier.
Pros
Superior water-holding capacity
PNA can hold up to 4,000 times its weight in water, significantly more than hyaluronic acid, providing deeper and longer-lasting hydration.
Gentle and non-irritating
It is well-tolerated by most skin types, including sensitive skin, and has a very low risk of causing irritation or clogging pores.
Cons and cautions
Potential tackiness
In high concentrations or when layered with other thick products, PNA can leave a slightly sticky or tacky feel on the skin.
Less research on long-term effects
While hydration benefits are clear, there is less published research on its long-term anti-aging or skin barrier repair effects compared to ingredients like hyaluronic acid or niacinamide.
Best for
- Anyone with dry or dehydrated skin looking for a powerful humectant
- People who want a lightweight alternative to heavy creams for hydration
Use caution if
- Those with extremely oily or acne-prone skin may prefer a lighter humectant like glycerin
Usage tips
Safety summary
PNA is considered very safe for topical use. It has a low irritation and comedogenic risk, making it suitable for most skin types, including sensitive skin. No significant adverse effects have been reported in cosmetic concentrations.
Research notes
Research supports PNA's superior water-binding capacity compared to hyaluronic acid. Studies show it improves skin hydration, reduces transepidermal water loss (TEWL), and enhances skin smoothness. However, more long-term clinical studies are needed to fully understand its anti-aging potential.
Common label clues
- Typical concentration
- 0.1% to 1%
- Regulatory status
- Generally recognized as safe for cosmetic use in the US and EU, with no known restrictions.
- Common uses
- Serums, Moisturizers, Sheet Masks, Eye Creams
- Environmental note
- PNA is biodegradable and produced through fermentation, which is considered a more sustainable process than many synthetic alternatives.
Good to know
- PNA is often derived from fermented soybeans, making it a vegan-friendly ingredient.
- It works well with other humectants like hyaluronic acid for a hydration boost.
Common questions
What is PNA (Polyglutamic Acid) in beauty products?
PNA, or Polyglutamic Acid, is a natural molecule made from fermented soybeans. It acts like a sponge on your skin, pulling in and holding onto water far more effectively than hyaluronic acid. This helps keep your skin feeling soft, smooth, and plump without being sticky or heavy.
What does PNA (Polyglutamic Acid) do in a beauty product?
When applied to the skin, PNA forms a thin, flexible film that traps moisture. It prevents water loss by creating a barrier that slows evaporation, while also drawing water from the environment into the outer layers of the skin. This dual action boosts hydration and supports a healthy skin barrier.
Is PNA (Polyglutamic Acid) safe for most people?
PNA is considered very safe for topical use. It has a low irritation and comedogenic risk, making it suitable for most skin types, including sensitive skin. No significant adverse effects have been reported in cosmetic concentrations.
Who should be careful with PNA (Polyglutamic Acid)?
Those with extremely oily or acne-prone skin may prefer a lighter humectant 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.