Efficacy and Safety of Deep Sea Water on the Blood Glucose Level

Inclusion Criteria: * Fasting plasma glucose concentration of 100-140 mg/dL or 2h-postprandial plasma glucose concentration of 140 \~199 mg/dL Exclusion Criteria: * Patients with type 1 or type 2 diabetes * HbA1c ≥9.0% * Weight decreased by more than 10% within past 3 months * Have clinically significant acute or chronic cardiovascular system, endocrine system, immune system, respiratory system, hepatic biliary system, kidney and Urinary system, neuropsychiatry, musculoskeletal, inflammatory and hematologic malignancies, gastrointestinal disorders, etc. * Hypoglycemic agent, obesity medicine, lipid lowering agent within past 6 months or functional food within past 2 month * Subjects who have taken corticosteroid within past 1 months * History of alcohol or substance abuse * Participation in any other clinical trials within past 2 months * Laboratory test by show the following results * Serum AST (aspartate aminotransferase) or ALT (alanine aminotransferase) \> 2 times the upper limit of normal range * Serum Creatinine \> 2.0 mg/dl * Pregnancy or breast feeding * If a woman of childbearing doesn't accept the implementation of appropriate contraception * Principal Investigator judged inappropriate for participation in study because of Laboratory test result, etc