Yizhi peptide is a biopeptide mainly used in laboratory research and chemical production processes. Peptide puzzle peptide is a seven peptide sequence THR-LYS-PRO-ARG-PRO-GLChemicalbookY-PRO. It is a synthetic analogue of a person's tetrapeptide phagocytic peptide. The drugs used in clinical trials provide sustained cognitive and therapeutic effects, which can be used to treat generalized anxiety disorder (GAD).