Study to Investigate the Effect of L. Lactis CKDB001 Administration on Liver Aminotransferases in Subjects With NAFLD

Inclusion criteria

• Adult men and women aged 19 to 75 years at the time of written consent
• Voluntarily provided written consent after receiving sufficient explanation about the study
• ALT or AST levels exceed the upper limit of normal, but are five times or less than the upper limit

Exclusion criteria

• Pregnant or breastfeeding women
• Women of childbearing potential and men who are unable or unwilling to use appropriate contraception during the study period
• Individuals with a history of alcohol abuse or chronic alcohol consumption:

Daily alcohol consumption averaging over 30g/day (210g/week) for men or over 20g/day (140g/week) for women

• Individuals with viral or other liver diseases that could affect study results:
• Individuals with a history of or current drug abuse
• Individuals with a history of psychiatric disorders or current psychiatric conditions that may interfere with the study
• Individuals with a history of major gastrointestinal surgery (excluding appendectomy, but including gastric resection, gastrointestinal bypass, anastomosis, bariatric metabolic surgeries)
• Individuals with severe comorbidities that make them unsuitable for study participation (e.g., heart disease, kidney disease, malignancy, immunosuppression, etc.):
• Regular consumption of probiotics, prebiotics, synbiotics, or fermented milk within 4 weeks prior to screening (participation allowed if consumption ceases at least 1 month before study start)
• Regular consumption of medications, health supplements, or herbal remedies that may affect liver function or anti-inflammatory responses within 4 weeks prior to screening (participation allowed if consumption ceases at least 1 month before study start)
• Use of medications that may cause hepatic steatosis (e.g., amiodarone, tamoxifen, methotrexate, tetracycline, corticosteroids)
• Use of medications for treating non-alcoholic fatty liver disease (NAFLD) or steatohepatitis (NASH) within 3 months prior to screening (e.g., thiazolidinediones, vitamin E)
• Use of medications that may affect study results (e.g., antipyretic analgesics, NSAIDs, anti-tuberculosis drugs, antibiotics, anticonvulsants, choleretics, liver disease medications)
• Use of oral steroids, hormones, or drugs that may affect absorption, metabolism, or excretion of food within 4 weeks prior to screening (participation allowed if taking systemic steroids or thyroid hormones in stable doses for ≥3 months before screening)
• Use of hypoglycemic agents or lipid-lowering drugs (except insulin or thiazolidinediones) with stable doses for at least 3 months prior to screening
• Dietary or exercise therapies that may affect study within 3 months prior to screening
• Smokers consuming more than 20 cigarettes per day
• Allergies or digestive issues related to study food ingredients
• Weight loss exceeding 10% of previous body weight within 6 months prior to screening
• Participation in another clinical trial within 30 days prior to screening or not completing the required five-half-life period of investigational drug/food from a previous trial
• Any other individuals deemed unsuitable for the study by the investigator