The purpose of this study is to evaluate the effect of aqueous extract of Salvia mirzayanii on the control of blood sugar in Type 2 diabetic patients. In this study, 58 Type 2 diabetic patients refer to diabetes clinic of Shahid Mohammadi Hospital, are divided into interventional and control groups. The interventional group receives capsules containing 450 mg of concentrated aqueous extract of Salvia mirzayanii and the control group receives placebo capsules containing 450 mg of caramelized flour and 5% of aqueous extract of Salvia mirzayanii. The inclusion criteria include patients with the age range between 19 and 65 years, who have BMI higher than 19 and lower than 30, patients with HbA1C higher than 7% and blood sugar higher than 126 mg/d. The exclusion criteria include pregnant women, patients with active infection or hepatitis, patients with blood pressure higher than 160/90 and cancer. The patients’ demographic information such as age, sex, height, weight, body mass index, types and dosage of used drugs will be collected. The tests including determination of FBS, HbA1C, liver enzymes, lipid profile and serum insulin will be conducted at the beginning of the study and after 3 months. Serum will be separated from 5cc blood of fasting patients and the mentioned measurements will be performed and the results will be compared in the interventional and control groups. This clinical trial is double blind (neither the administrator nor the subject know which subjects receive a real drug or placebo).