Type 2 diabetes is a prevalent metabolic disorder and has several complications affecting the vascular system. Broccoli sprouts rich is a source of sulforaphane with high antioxidant activity. Cell culture and animal studies showed that sulforaphane prevents diabetic vascular complications and improve lipid profile, but little is known about the direct effects of broccoli sprouts in diabetic patients. The purpose of this study is to investigate effects of broccoli sprouts powder (BSP) on fasting blood sugar, lipid profile and oxidative stress index. This study is a randomized double blind clinical trial. Fifty type2 diabetic patients will be recruited from an endocrine clinic and randomly will be assigned into 2 groups, the BSP and the placebo. Subjects in the BSP and the placebo groups will consume 10g/d BSP and corn starch powder for 4 weeks, respectively. For all subjects, medical history, 3 consecutive 24-h dietary recalls, and physical activity questionnaire will be collected and anthropometric measurements will be recorded at baseline and 4 weeks after supplementation. Also, a 14 hour overnight fasting blood sample will be taken for biochemical analysis, including fasting blood sugar, cholesterol, triglycerides, LDL-C, HDL-C, total antioxidant capacity and total oxidant status.