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(Original Articles) Effects of Nattokinase on Blood Pressure: A Randomized, Controlled Trial
KIM, Ji Young,KIM, Kyong-Chol,OGASAWARA, Kazuya,INOUE, Kenichi,PARK, Sungha,JANG, Yangsoo,LEE, Jong Ho,LIM, Hyo Hee,GUM, Si Nae Japanese Society of Hypertension 2008 Hypertension research Vol.31 No.8
The objective of this study was to examine the effects of nattokinase supplementation on blood pressure in subjects with pre-hypertension or stage 1 hypertension. In a randomized, double-blind, placebo-controlled trial, 86 participants ranging from 20 to 80 years of age with an initial untreated systolic blood pressure (SBP) of 130 to 159 mmHg received nattokinase (2,000 FU/capsule) or a placebo capsule for 8 weeks. Seventy-three subjects completed the protocol. Compared with the control group, the net changes in SBP and diastolic blood pressure (DBP) were ?5.55 mmHg (95% confidence interval [CI], ?10.5 to ?0.57 mmHg; p<0.05) and ?2.84 mmHg (CI, ?5.33 to ?0.33 mmHg; p<0.05), respectively, after the 8-week intervention. The corresponding net change in renin activity was ?1.17 ng/mL/h for the nattokinase group compared with the control group (p<0.05). In conclusion, nattokinase supplementation resulted in a reduction in SBP and DBP. These findings suggest that increased intake of nattokinase may play an important role in preventing and treating hypertension.