Luxiface Ingredient Intelligence

Polyglutamic Acid

A water-binding polymer used to boost surface hydration and help skin feel smooth and supple.

Also known as: PGA

Hydration Evidence: Established

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Ingredient overview

What is Polyglutamic Acid?

Polyglutamic acid, often abbreviated PGA, is a water-loving polymer made from linked glutamic acid units. In skincare it is mainly used as a humectant and film-forming hydration ingredient that can help the skin surface feel smoother and more supple.

Research on cosmetic poly-gamma-glutamic acid is newer and less extensive than the evidence base for ingredients such as glycerin or hyaluronic acid. Early laboratory and formulation studies support water retention and barrier-related benefits, but the effect still depends heavily on molecular weight and product design.

At a glance

Why it is used

HydrationPlumpingSmoothness

Often chosen for

Common concerns

DehydrationDryness

Skin types

DryNormalOilyCombinationSensitive

Routine role

HydrationSerumMoisture support

Routine guidance

How to use it

Polyglutamic acid is commonly used in hydrating serums and creams and can be applied morning or evening before heavier moisturizers or sunscreen.

Pairing guidance

Routine compatibility

It layers easily with hyaluronic acid, glycerin, niacinamide, ceramides and most treatment actives.

Formula context matters

Good to know

Evidence is still developing and different molecular forms may behave differently, so avoid treating all PGA formulas as equivalent.

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Relevant Luxiface routines

See complete routines where this ingredient fits alongside compatible steps.

Korean Advanced Brightening Essential Trio£51.00View routine →

Korean Moderate Acne and Post-Blemish Mark Routine£73.00View routine →

Korean Skincare Routine for Blackheads and Whiteheads- Normal Skin£69.00View routine →

Korean Skincare Routine for Blackheads and Whiteheads- Oily Skin£69.00View routine →

Korean Skincare routine for Dark Circles and Puffiness- Oily Skin£75.00View routine →

Korean Skincare Routine for Hyperpigmentation and Dark Spots - Normal Skin£66.00View routine →

Keep exploring

Related ingredients

Hyaluronic Acid Glycerin Beta-Glucan Panthenol

Ingredient information is educational. Product suitability depends on the complete formulation, concentration, how it is used and your individual skin.

Sources & further reading

These references support the ingredient overview. Performance and suitability still depend on the finished product, concentration and how it is used.