Aim:We investigated the comparison of the effects of N-acetylcysteine, silybum marinaum, propofol, and vitamin E on liver hepatic regeneration after partial hepatectomy. Method: Forty-eight rats were randomized into 6 different groups of the same age and weight. After partial hepatectomy, all animals were resuscitated with 5 ml of isotonic sodium chloride solution administered subcutaneously while group 1 (sham) did not receive any injection, group 2 (control) received serum physiologic intraperitoneally, group 3 received 25 mg /kg of propofol intraperitoneally, group 4 received 20 mg/kg of N-acetylcysteine intraperitoneally, group 5 received 400 mg/kg of vitamin E intraperitoneally, and group 6 received 10 mg/kg of silybum intraperitoneally. None of these groups were given antibitotics. On the third day, a half of the rats, and on the seventh day, the other half of rats were reoperated and sacrifi ced. Results: Blood samples were used for biochemical parameters (AST, ALT). Ki-67 proliferation index was used for histopathologic parameters. A statistically meaningful difference was detected in silybum, vitamin E, N-acetylcysteine, and propofol groups for AST, ALT levels when compared to control and sham groups (p<0.05). Ki-67 regeneration proliferation index of all groups, which were given agents on the third and seventh days were statistically higher than the control and sham groups (p<0.05). During the evaluation, AST, ALT, Ki-67, Ro (regeneration value) levels of silybum group displayed a statistically signifi cant difference according to other groups (p<0.05). Conclusion: Our experimental study indicates that hepatic regeneration after partial hepatectomy was meaningful and signifi cant in groups with intraperitoneal administration of silybum marinaum,vitamin E, N-acetylcysteine and propofol. Hepatic regeneration rate was particularly higher in silybum group compared to other groups (Fig. 16 The liver is the largest internal organ of the human body. It has important roles in regulating the metabolic functions, and in the immune system. After resection or traumatic injury, the liver is a single organ capable of fast tissue regeneration. In order to maintain the existing liver functions after liver resection, the period and effect of hepatic ischemia before and during the resection should be reduced to minimum,. Besides, after the resection, the increase in hepatic blood fl ow and the reduction of infl ammatory events are currently getting increasingly important.The postoperative mortality rate in liver resection depends directly on preoperative liver functions and liver resection volume.