The aim of this clinical trial is to study the effect of Berberis Vulgaris on non alcoholic steatohepatitis in patients with nonalcoholic fatty liver disease. in Design of This Study 80 patients will be included That major including criteria are : older than 20 years with nonalcoholic-fatty liver disease and liver enzymes> 42 and proportion of ALT/ AST> 1. The fatty liver will be recognized by sonography. Exclusion criteria are : using drugs that affect liver tests during the last 2 , viral hepatitis, hemochromatosis, autoimmune hepatitis, cirrhosis,Type 1 diabetes , Alcohol dependency, Pregnancy,Breast feeding, and Infectious diseases.in Intervention : Intervention group will be administrated 750 mg of Berberis Vulgaris Fruits Extract BID during 3 month and control group will be given placebo. main outcomes are : Liver enzymes and fasting blood sugar That will be assessed Before, after 45 days and 3 months of treatment course, tri glycirid, total cholestrol, LDL and HDL Will be Measured Before and End of Study. be