The study is devoted to the Epifamin effect on values of carbohydrate and lipid metabolism, immune status in blood, and also content of 6-sulfatohymelatonin as the main metabolite of melatonin, in urine of the patients with non-alcoholic steatohepatitis developing at type 2 diabetes mellitus. It is shown that fasting glucose, postprandial glucose level and glycated hemoglobin content in the blood of patients decreased significantly during combined treatment with the Epifamin compared to the basic therapy. The results of the Epifamin reception are as follows: more expressed normalization of lipid metabolism, and content of β -lipoproteins, cholesterol, lipoproteins of low density and high density lipoprotein, and atherogenic index in comparison with the results obtained after basic treatment. The obtained results testify to positive Epifamin effect on values of the immune status of patients: level of circulating immune complexes, the main classes of immunoglobulins – IgA, IgM, IgG. It was established that in the patients with non-alcoholic steatohepatitis developing at type 2 diabetes mellitus, 6-sulfatohymelatonin level in urine was lowered on the average by 1,2 times in comparison with control. After basic treatment the reliable changes of the 6-sulfatohymelatonin content in the patients didn’t reveal. After the combined therapy with the Epifamin, the 6-sulfatohymelatonin content in the patients increased on the average for 13.9%. The obtained results allow to conclude about correction the Epifamin effect on melatonin content as a hormone, which able to participate in regulation of carbohydrate and lipid metabolism and to have immune modulating action. The Epifamin use in basic treatment had favorable influence on the immune status, values of carbohydrate and lipid metabolism in blood in the patients with non-alcoholic steatohepatitis developing at type 2 diabetes mellitus that was apparently due to melatonin-corrective effect of this drug.