1. obstacle function

With the decrease of skin lipid content, the skin barrier function decreases. The study on the relationship between epidermal barrier function and sphingolipid synthesis found that when the skin barrier function was disordered, sphingolipid synthesis increased, and after 24 hours, the skin barrier function returned to normal, and sphingolipid synthesis also returned to normal.

Therefore, ceramide plays a very important role in maintaining skin barrier function.

Step 2 support

The ceramide and protein on the cell surface play the role of combining cells through ester bonds, and this relationship is called "lipid-cell-protein" inclusion body. The mechanism of desquamation of dry skin was studied. The results show that the main reason of skin dryness is the decrease of ceramide content in cuticle of epidermis, which is directly related to the degree of skin dryness. The application of ceramide can obviously enhance the adhesion between keratinocytes, improve skin dryness and reduce skin desquamation.

3. Moisturizing effect

The moisture content of skin accounts for about 18%~20% of body weight. The moisture content and elasticity of skin are closely related to the moisture content of epidermis. Excessive loss of skin moisture will lead to dry skin and even chapped skin. Ceramide has a strong ability to associate water molecules and maintain skin moisture by forming a network structure in the stratum corneum.

Therefore, ceramide has the function of keeping skin moisture.

4. The function of delaying skin aging

In the process of skin aging, lipid synthesis decreases and ceramide content in stratum corneum decreases. The use of ceramide can increase the ceramide content in the cuticle of epidermis and improve the dryness, desquamation and roughness of skin. At the same time, ceramide can increase the thickness of stratum corneum, improve the water-holding ability of skin, reduce wrinkles, enhance skin elasticity and delay skin aging.