Ingredient review
Potassium Hydrolyzed Polygamma-Glutamate
INCI: POTASSIUM HYDROLYZED POLYGAMMA-GLUTAMATE
A gentle, high-performance humectant derived from fermented soy that holds water on the skin better than hyaluronic acid in some conditions.
In plain English
This ingredient is a type of natural polymer made from fermented soybeans. It works like a sponge on your skin, holding onto water and forming a thin, invisible film that keeps moisture from evaporating. It's often used as a gentler alternative to hyaluronic acid, especially for people with sensitive or dehydrated skin.
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
Potassium Hydrolyzed Polygamma-Glutamate 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 Potassium Hydrolyzed Polygamma-Glutamate.
- 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
Potassium Hydrolyzed Polygamma-Glutamate is the potassium salt of a hydrolyzed form of polygamma-glutamic acid, a natural polymer produced by fermentation of Bacillus subtilis (a beneficial bacteria) using soybeans. It is a large, water-loving molecule that can hold many times its weight in water.
How it works
When applied to the skin, it forms a flexible, breathable film that physically traps water molecules. This film reduces transepidermal water loss (TEWL), meaning less water escapes from your skin into the air. It also helps other humectants and moisturizing ingredients work more effectively by keeping the skin surface hydrated for longer.
Pros
Superior water-holding capacity
This ingredient can hold up to 5,000 times its weight in water, outperforming hyaluronic acid in low-humidity environments, making it ideal for dry climates or winter use.
Gentle on sensitive skin
Unlike some humectants that can cause stinging or irritation, this ingredient is very well-tolerated and can even help soothe irritation by maintaining a healthy moisture barrier.
Cons and cautions
Potential tackiness
At higher concentrations or if applied too thickly, it can leave a slightly sticky or tacky feel on the skin until fully absorbed, which may not be ideal under makeup.
Layering challenges
Because it forms a film, it may not mix well with heavy oils or silicones, potentially causing pilling (little balls of product) if applied in the wrong order.
Best for
- Anyone with dry or dehydrated skin
- People with sensitive skin looking for a gentle humectant
- Those who find hyaluronic acid irritating or ineffective
Use caution if
- Individuals with known soy allergy (though the protein is highly processed, trace risk exists)
Usage tips
Safety summary
Potassium Hydrolyzed Polygamma-Glutamate is considered very safe for topical use. It is non-irritating, non-sensitizing, and non-comedogenic. The only potential concern is for individuals with a severe soy allergy, though the risk is extremely low due to the extensive processing.
Research notes
Research shows that polygamma-glutamic acid and its derivatives are effective humectants with superior water-binding capacity compared to hyaluronic acid in some conditions. Studies also indicate it can enhance skin barrier function and reduce TEWL. More human clinical trials are needed to fully compare its long-term efficacy against other top humectants.
Common label clues
- Typical concentration
- 0.1% to 2%
- Regulatory status
- Generally recognized as safe for cosmetic use in the US and EU. No specific concentration restrictions are common.
- Common uses
- Serums, Moisturizers, Sheet masks, Eye creams
- Environmental note
- Produced via fermentation, which is a relatively low-impact, sustainable process. The soy used is typically non-GMO and sourced from controlled supply chains.
Good to know
- This ingredient is often derived from non-GMO soybeans through a fermentation process, making it a sustainable and vegan-friendly option.
- It is sometimes called 'Natto Gum' because it is related to the sticky substance found in the Japanese fermented soybean dish, natto.
Common questions
What is Potassium Hydrolyzed Polygamma-Glutamate in beauty products?
This ingredient is a type of natural polymer made from fermented soybeans. It works like a sponge on your skin, holding onto water and forming a thin, invisible film that keeps moisture from evaporating. It's often used as a gentler alternative to hyaluronic acid, especially for people with sensitive or dehydrated skin.
What does Potassium Hydrolyzed Polygamma-Glutamate do in a beauty product?
When applied to the skin, it forms a flexible, breathable film that physically traps water molecules. This film reduces transepidermal water loss (TEWL), meaning less water escapes from your skin into the air. It also helps other humectants and moisturizing ingredients work more effectively by keeping the skin surface hydrated for longer.
Is Potassium Hydrolyzed Polygamma-Glutamate safe for most people?
Potassium Hydrolyzed Polygamma-Glutamate is considered very safe for topical use. It is non-irritating, non-sensitizing, and non-comedogenic. The only potential concern is for individuals with a severe soy allergy, though the risk is extremely low due to the extensive processing.
Who should be careful with Potassium Hydrolyzed Polygamma-Glutamate?
Individuals with known soy allergy (though the protein is highly processed, trace risk exists)
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.