This is the report to assess supplementation with soybean peptides on blood pressure among people with mild hypertension. Thirty subjects with systolic blood pressure (SBP) between 120 and 159 mm Hg and/or diastolic blood pressure (DBP) between 80 and 99 mm Hg were randomized to ingest 2 bags of soybean peptides or placebo per day for 8 weeks of a stage. Anthropometric measurements (blood pressure, body weight, body fat) and blood biochemical markers including fasting blood glucose (FBG), albumin, total cholesterol (TC), triglyceride (TG), HDL-C, LDL-C, creatinine (Cr), blood urea nitrogen (BUN), AST, ALT) were examined every four weeks.