PGA hydrogel is a type of cross-linked polyglutamic acid. PGA hydrogel has a unique three-dimensional grid structure, which helps it holding water as much as 1000-2000 times of its own weight. PGA hydrogel can produce a unique jelly-like skin feeling, no-greasy, no-viscous, and being smooth. PGA hydroge can scavenge free radical effectively, which endow it the ability to reduce oxidative stress. In addition, PGA hydrogel is derived from biological fermentation. It is green， natural， and has great biocompatibility.

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