Investigation on Safety and Efficacy of Soybean Fermented Extract (MBS217) in Treating Patients With NAFLD

Inclusion Criteria: * Male or female subjects aged between 20 and 70 years old. * Serum ALT of the subject is between 40-200 U/L. * The subject is diagnosed as NAFLD through FibroScan (CAP \> 220 db/m). * BMI of the subject is between 18.5-40 kg/m2. * The subject is able to provide written informed consent by himself/herself and agrees to comply with all protocol requirements. * The subject agrees to comply with the following two requirements: comply with all follow-up visit requirements according to the trial protocol. comply with all requirement regarding fecal samples collection, storage and delivery according to the trial protocol. * If the subject is reproductive women, she should agree to take more than two ways of contraceptive methods. Exclusion Criteria: * The subject is pregnant or lactating. * The subject has received any antibiotic (excluding topical agents), antifungals or antivirals within 30 days prior to visit 1. * The subject has received any steroids (excluding topical agents), immunosuppressant or anti-inflammation drugs within 14 days prior to visit 1. * The subject has received probiotics or prebiotics 14 days prior to visit 1. * The subject has received medication affecting evaluating indicators, including hepatitis and lipid metabolism related compounds, but excluding the following medicines: Statins, Fibrates, Silymarin, N-Acetyl Cystein, Thiazolidinediones, Metformin, Fibrate, Cholestyramine, Ezetimibe, Orlistat, SGLT2i and GLP1-RAs. * The subject has a clinically significant, currently active or underlying diarrhea (loose stools more than three times in 24 hours) of infectious etiologies. * The subject who has been diagnosed a severe/injury hepatic disease, acute/chronic viral hepatitis B, acute/chronic viral hepatitis C, human immunodeficiency virus infection, disease affecting liver function, active inflammatory bowel disease, gastric ulcer, chronic kidney disease, kidney function repairmen, chronic gut inflammatory disease, coronary artery disease with arterial stent surgery in half year, cancer, autoimmune disease, fasting glucose≥ 300 mg/dl, HbA1c\>9%, or serum triglyceride≥ 500 mg/dl. * The subject currently is participating in studies involving other investigational drugs, medical devices, functional foods, or cosmetic within 30 days prior to visit 1. * The subject has participated in body weight control plan within 60 days prior to visit 1. * The subject has an alcohol abuse problem. * The subject has been aboard for 10 days within 60 days prior to visit 1, or plans to go aboard during this study. * The subject has soybean allergy. * The subject is vegetarian or special diet. * The subject is considered by the investigator as not suitable for the trial.