Clinical Study to Evaluate the Effects and Safety of Green Tea Extract on Blood Glucose Regulation

Inclusion Criteria: * Males and females aged between 19 to 64 years * BMI between 18.5 and 29.9kg/m² * fasting blood glucose between 100 and 139 mg/dL (Note: if some subjects with blood glucose range of 126 - 139 mg/dL, those who are taking or requre medication must be excluded to meet ethical standards.) * subjects who voluntarily decide to participate in this study and sign the informed consent form. Exclusion Criteria: * Individuals taking to obesity, dyslipidemia, or uncontrolled hypertension at the screening * Individuals diagnosed with diabetes and who have taken medications related to blood glucose * Individuals congenital enzyme deficiencies related to sugar metabolism. * with hypersensitivity to the test food or ingredients(e.g., green tea, caffeine). * Individuals ongoing treatment diseases significantly related glucose metabolism. * Individuals with a history of surgery significantly related to glucose metabolism within the last 6 months * diagnosed with gastrointestinal diseases, cardiovascular diseases, uncontrolled chronic medical conditions, thyroid disorders, or active malignant tumors requiring medication * Individuals with liver function impairment or acute or chronic hepatitis or liver cirrhosis * Individuals with renal disorder * Individuals with a weight change of 5 kg or more within the last 3 months.