Bestim is a dipeptide with immunomodulatory effect, which can change cellular and humoral immunity and increase antibacterial and antiviral properties. The main role of Bestim is to increase the differentiation and proliferation of T lymphocyte progenitor cells, stimulate IL-2 production, increase IL-2 receptor expression and T cell differentiation markers. Bestim is composed of two amino acids. In peptide synthesis, liquid phase synthesis is generally used.