The structural formulas of tetrapeptide and pentapeptide are as follows: tetrapeptide is a tetrapeptide derived from skin itself, which has a unique structure and can promote the synthesis of extracellular matrix, thus reducing various wrinkles and improving skin aging. Tetrapeptide 2 1 is more effective than Matrixyl, which is very popular in the market. Pentapeptide: five amino acids stripped of four molecules of water, containing four peptide bonds, at least one free amino group and carboxyl group, and the basic structure is amino acid.