Polyglutamic acid is a hydrating skin ingredient derived from fermented soybeans
Dermatologists and skincare brands describe polyglutamic acid as an amino acid peptide chain used in serums to bind water at the skin's surface.
Composition and origin of the ingredient
The substance is a peptide chain of glutamic acid that comes from fermented soybeans. It functions primarily as a humectant by binding and retaining moisture on the skin.
Comparison with other hydrators
Some claims suggest it holds up to 4,000 times its weight in water, though this was found only in a lab setting. No head-to-head comparison exists between polyglutamic acid and hyaluronic acid in actual skin applications.
Recommended products for different needs
Vogue lists specific options including the Byoma Phyto Mucin Glow Serum as the best overall choice. Other selections include Cetaphil for drugstore buyers and Prequel Skin for sensitive skin types.
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