Introduction. Monos Group, Drug Research Institute is starting to investigate of Ellipin preparationfrom the mid-1990s, Ellipin has anti cancer activity in liver and several studies were investigated withscientists from Japan and China. Especially Hayashi K., Khurelbaatar L and Ambaga M were determinedanti-cancer action of the preparation and they were explained of mechanism of action, which apoptosisis seduced by influence of unsaturated fatty acids in tumor cells. However, changes of fatty acidscomposition at production stage were did not study yet. Therefore, we studied that composition of fattyacids in different term of production stage and compared of Ellipin dense substance.Materials and Methods. Samples of study were collected from production stage of “Ellipin” series130304, which was tacked in 48th hour, 120th hour of production. Each sample was dried at freezedryer “Labconco freezone12L” in Drug Research Institute. Total lipids of sample were extracted withchloroform: methanol (2: 1 v/v) according to Folch et al. Fatty acid methyl esters were analyzed usingAgilent Packard Gas Chromatograph (GC) (Model HP-6890 Agilent Packard) with mass-spectrumdetector (Model HP MSD 5973N) of Buryat State University, in Ulan-Ude.Results. Ellipin preparation is derived from bovine liver, and which is based on homogenization of bovineliver for isotonic. In this process, unsaturated fatty acids were extracted in organic solution. We studiedchanges which saturated and unsaturated fatty acids of bovine liver in process of homogenization andconsist of each fatty acid contents of end product. Results have shown that unsaturated fatty acidswere decreased by 0.4-44% till 120th hour of homogenization process. While, there were decreasedby 4-12% in the end product, although, ω-6 fatty acids were increased by 13.1-38.4%. Moreover, 25saturated fatty acids and 12 unsaturated fatty acids were detected in the Ellipin dense substance (endproduct). Hence, 67.5% of total fatty acid was saturated fatty acids, 32.5% was unsaturated fatty acidsin the Ellipin dense substance. Resent results and results of previous studies indicated that Ellipindense substance may contains saturated fatty acids on in average 50.34%, unsaturated fatty acids onin average 49,32%, respectively.Conclusion. Proportion of saturated and unsaturated fatty acids in Ellipin production was about 2:1.Saturated fatty acids and unsaturated fatty acids were found 25 and 12, respectively. Saturated fattyacids were gradually decreased and unsaturated fatty acids were slowly increased in production period,which from 48th hour of production-conveyer till end product. Moreover, content of ω-3-6-9 fatty acidswas consist 83,9-87,5% of total unsaturated fatty acid.