What is Polyglutamic Acid?
Polyglutamic acid (PGA) is a powerful humectant - a water-binding ingredient - that can hold even more moisture than hyaluronic acid. It sits more on the surface, forming a light, dewy film that locks hydration in for a plump, glassy finish. It is the newer, more intense cousin of HA.
How Polyglutamic Acid works
PGA has larger molecules than most hyaluronic acid, so it stays nearer the surface and forms a moisture-holding film rather than sinking in deeply. That film keeps water from evaporating, so hydration lasts longer and skin looks dewy and plump. It layers beautifully on top of, or with, hyaluronic acid.
Benefits of Polyglutamic Acid
Holds more water than HA and locks it in for a dewy finish.
Gives that smooth, bouncy, glass-skin look.
Hydrated skin makes fine dehydration lines less obvious.
Lightweight and non-greasy, even for oily skin.
Is Polyglutamic Acid good for your skin type?
Intense, long-lasting hydration.
Delivers that dewy, glassy finish.
Lightweight surface hydration without heaviness.
Gentle and non-irritating.
Plumps and softens the look of fine lines.
Polyglutamic Acid vs other ingredients
HA draws water and sinks in a little deeper; PGA holds even more water and stays on the surface as a longer-lasting dewy film. They are not rivals - layering HA then PGA gives deep plus long-lasting hydration.
Both are humectants. Glycerin is a cheap, effective all-rounder; PGA gives a more intense, longer-lasting dewy surface hydration. Many formulas use both.
PGA adds and holds water on the surface; ceramides seal it in and repair the barrier. Use PGA first, then a ceramide moisturiser to lock it all in.
How to use Polyglutamic Acid
Apply PGA to slightly damp skin, and for maximum effect layer it over a hyaluronic acid serum, then seal with a moisturiser. Use morning and/or night. Like all humectants, it works best when sealed, especially in dry air.
Can you combine Polyglutamic Acid with other actives?
- With Hyaluronic Acid. The classic combo - HA for deeper hydration, PGA on top to lock in a longer-lasting dewy finish.
- With a moisturizer. Always seal PGA with a cream so the water stays put.
- With actives. A great buffer - PGA hydrates and comforts alongside retinol or acids.
Side effects & safety
Polyglutamic acid is very safe and rarely irritates. Like any humectant, on dry skin in dry air it works best when sealed with a moisturiser. Patch test new products. General information, not medical advice.