Thymopentin is mainly the active ingredient in thymus secretion, which has five amino acids composed of five amino acids, namely arginine, lysine, aspartate, valine and tyrosine. The main function is to induce the differentiation of immune cells, make the immunity of the body stronger, induce the occurrence of other immune reactions and enhance the resistance of patients. It can be applied to patients with malignant tumor, after radiotherapy, immune function damage and need to rebuild immune system, as well as the treatment of hepatitis B and C. In case of major surgery and patients with serious infection, thymopentin can be used to enhance the immunity of patients and rebuild immune system. It can also be applied for certain autoimmune diseases, such as rheumatism, rheumatoid, type 2 diabetes, lupus erythematosus, and other immunocompromised people.