Sodium polyglutamate is the sodium salt of polyglutamic acid, a biopolymer obtained through fermentation consisting of linked glutamic acid units. Due to its high molecular weight, it acts primarily on the skin’s surface, where it forms a moisture-retaining film. The active ingredient provides immediate hydration, improves skin elasticity, and leaves the skin feeling pleasant. It can also enhance the stability of hyaluronic acid. (1-3)