Polyglutamic acid
Also known as: Poly-L-glutamic acid, γ-polyglutamic acid, γ-PGA
A fermented amino acid polymer that holds moisture in skin, delivering hydration similar to hyaluronic acid.
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Get the appWhat it does
Polyglutamic acid is a natural polypeptide derived from bacterial fermentation that functions as a powerful humectant, drawing water into the skin and forming a hydrating film on the surface. It has a higher molecular weight than hyaluronic acid, allowing it to remain on the skin longer and provide sustained moisture. It enhances skin plumpness and smoothness while supporting the skin barrier.
Benefits
- Intense hydration without heaviness
- May last longer on skin than hyaluronic acid
- Supports skin elasticity and firmness
- Lightweight, suitable for layering
- Generally well-tolerated and stable
Who it suits
- Dehydrated skin
- Dull or tired-looking skin
- Sensitive skin
- All skin types
- Those seeking HA alternatives
How to use
Apply to damp skin as part of your hydrating serum or essence step, before moisturizer. Layer with other hydrating ingredients for enhanced effect.
Pairs well with
Hyaluronic acid, Glycerin, Niacinamide, Peptides
Be careful pairing with
none notable
Safety & cautions
Generally safe and non-irritating at typical concentrations (0.5–2%). May feel slightly tacky at higher levels; best used in serums or hydrating essences rather than thick creams.
Educational information, not medical advice. Concentration and formulation change how an ingredient behaves.