(Lys8, Lys9)-Neurotensin (8-13) is an improvement based on the original Neurotensin sequence. Two basic amino acids are added. The sequence change increases the water solubility of the peptide to a certain extent, and makes the peptide synthesis. The process becomes simpler. For the sequence of (Lys8, Lys9)-Neurotensin (8-13), Go Top Peptide Biotech will choose large-scale production to reduce the cost of peptides and provide better prices.