... ,PGA is a real long-lasting moisturizing and skin care product.γ-PGA and the hydrogel forms smooth,elastic,moisturizing soft film on ... hydra ability,which can improve the skin moisture without break the skin moisture balance inside and outside.Used in skin-care products,PGA ... synthesis to prevent and reduce wrinkles and freckles.As shown in table 2,PGA has good skin whitening effect,more than ...