Our use of the melatonin-containing complex in the treatment of animals with a model of obesity and type 2 diabetesmellitus showed its pronounced hepatotropic, lymphotropic action and cytoprotective effect, which consists in stimulatingthe expression of the antiapoptotic Bcl-2 protein in liver cellsagainst the background of a decrease in the proapoptotic Badprotein activity (Michurina et al., 2017, 2020). Here, BCL2 is linked to obesity due to melanocortin 4 receptor deficiency.