The purpose of this study is to evaluate the effect of mulberry leaf extract on blood glucose in subjects with impaired fasting glucose.

The purpose of this study is to evaluate the effect of mulberry leaf extract on blood glucose in subjects with impaired fasting glucose. After 2 weeks run-in period for wash-out, subjects will randomly assigned to two groups, i.e. control group (placebo) or mulberry leaf extract group. They will intake placebo or mulberry leaf extract for 4 weeks. Biomarkers will be analyzed in blood samples in 0 and 4 weeks.

Inclusion Criteria:

• Age: over 20 years
• Fasting glucose: 100mg/dl ≤ ~ ≤ 125mg/dl
• HbA1c: < 6.5%

Exclusion Criteria:

• Subject who has taken medicines, Chinese medicines and Health/Functional Foods which can affect glucose metabolism in 30 days prior to screening visit
• Subject who has taken part in other clinical trials in 30 days prior to screening visit
• Subject who is pregnant or breast feeding
• Subject who lost body weight over 4 kg in 30 days prior to screening visit
• Alcoholic
• Heavy smoker (≥ 20 cigarettes/day)
• Subject who has heart failure, coronary artery disease, uncontrolled hypertension (≥ 140/90mmHg), diabetes (fasting blood glucose ≥ 126mg/dL), renal dysfunction, liver failure, hyperthyroidism, hypothyroidism, cancer or mental disease
• Subject who has an allergy to the ingredients of study product