The main function of polyglutamic acid in cosmetics and skin care products is moisturizing agent and skin conditioner. The risk factor is 1, which is relatively safe and can be used at ease. Generally, it has no effect on pregnant women, and polyglutamic acid is not acne-causing. Polyglutamic acid can promote the activity of fiber bud cells and has revitalizing effect. It can be used for anti-aging and anti-wrinkle cosmetics. Larger molecular weight of polyglutamic acid on fiber bud cell activity promotion is not as small molecular weight, but its stable foam, moisturizing ability, adsorption on the hair performance is better than small molecular weight products, used in the hair water, can be antistatic, hair soft 'polyglutamic acid has the effect of whitening skin.