Purified Anthocyanins Supplementation in Type 2 Diabetes Mellitus

Inclusion Criteria: * Subject is diagnosed with type 2 diabetes mellitus according to the Chinese type 2 diabetes prevention guide 2010, diagnostic criteria are as follows:(1) Diabetes symptoms (polydipsia, polyphagia, polyuria, weight loss, skin itching, blurred vision and other acute metabolic network disorder that caused by high blood sugar)combined with random blood sugar ≥11.1 OR,(2)fasting plasma glucose(FPG)≥7.0 OR (3)2h blood sugar after oral glucose tolerance test(OGTT)≥ 11.1 * Subject is between 25 and 75 years of age, inclusive. * Subject BMI is ≥18.5 kg/m2 and ≤35 kg/m2 Exclusion Criteria: * Subject that is diagnosed as type 1 diabetes, gestational diabetes and other kinds of diabetes expect type 2. * Subject that use exogenous insulin for glucose control. * Subject that has a history of diabetic ketoacidosis. * Subject that has coronary artery disease, mental disorder, cancer, cirrhosis, renal disease and hepatic disease. * Subject that has had operation less than six months prior to screening visit. * Subject that uses supplementation with vitamins or antioxidants.