Polyglutamic Acid (PGA) is a highly effective water-binding and moisturizing cosmetic ingredient. It is a polymer composed of glutamic acid units and is commonly produced through microbial fermentation. Despite the word “acid” in its name, Polyglutamic Acid is not an exfoliating acid like glycolic, lactic, or mandelic acid. In skincare, its primary function is as a humectant, moisturizer, and skin-conditioning ingredient. Polyglutamic Acid Powder is suitable for hydrating facial serums, anti-aging serums, moisturizers, creams, lotions, facial masks, toners, essences, eye products, after-sun products, shampoos, conditioners, and hair serums.
Benefits & Uses in Cosmetics
Hydration Attracts and retains water at the skin surface
Moisture Retention Helps reduce moisture loss and maintain hydration
Skin Plumping Hydration can give skin a smoother, fuller appearance
Fine-Line Appearance Helps soften the visible appearance of dehydration lines
Skin Conditioning Leaves skin feeling softer and smoother
Barrier Support Helps maintain a hydrated surface environment
Film Forming Forms a lightweight moisture-retaining film on the skin
Hair Conditioning Can improve moisture, softness and manageability in hair products
Typical Usage Rate
A practical starting range is approximately 0.1–1.0% in many skincare formulations. The appropriate amount depends on the molecular weight/viscosity grade and the desired texture.
For a lightweight hydrating facial serum, I would generally start around 0.2–0.5% and adjust after evaluating viscosity and skin feel.
Formulation Tip
Polyglutamic Acid powder should be slowly dispersed into the water phase while mixing to prevent clumping. Allow sufficient time for complete hydration before evaluating the final viscosity.
It works particularly well in hydration-focused formulas alongside ingredients such as Hyaluronic Acid, Glycerin, Sodium PCA, Betaine, Panthenol, Niacinamide, and Aloe Vera.
