... skin whitening 3.Skin feel better than HA Introduction:Gamma poly glutamic acid (gamma-PGA) is a natural, multi functional, biodegradable ... acid monomers connected by amide linkages between apha-amino and gamma-carboxyl groups. It is biodegradable, edible and non ... different molecular. It has high water absorbability and moisturizing effect. gamma-PGA can be used as thickener, gel, filmogen, humectant, ...