1. Moisturizing: Collagen peptide contains hydrophilic natural moisturizing factor, which directly forms collagen after entering human body, keeping skin moist and smooth at all times. 2. Nutrition: Collagen peptide has strong permeability to skin, can combine with skin epithelial cells through stratum corneum, participate in and improve the metabolism of skin cells, and enhance the collagen activity in skin. It can maintain the integrity of moisture and fiber structure of stratum corneum, improve the living environment of skin cells, and achieve the purpose of moisturizing skin.