Ceramide is a type of phospholipid with ceramide as the skeleton, mainly including ceramide phosphorylcholine and ceramide phosphorylethanolamine. , Neurochemicalbook amide is the main part of the intercellular matrix and plays an important role in maintaining the balance of moisture in the stratum corneum. Ceramides have a strong ability to associate with water molecules and maintain skin moisture by forming a network structure in the stratum corneum. Therefore, ceramides have the effect of maintaining skin moisture.