Ginseng for Treating Hypertension: A Systematic Review and Meta-Analysis of Double Blind, Randomized, Placebo-Controlled Trials

Curr Vasc Pharmacol. 2017;15(6):549-556. doi: 10.2174/1570161115666170713092701. . Lee HW1, Lim HJ2, Jun JH3, Choi J3, Lee MS4. Author information 1 KM Convergence Research Division, Korea Institute of Oriental Medicine, Daejeon. Korea. 2 Department of Nursing, Chodang University, Muan. Korea. 3 Clinical Research Division, Korea Institute of Oriental Medicine, Daejeon. Korea. 4 Clinical Research Division, Korea Institute of Oriental Medicine, Daejeon 34054. Korea. Abstract BACKGROUND: Evidence of ginseng for reducing blood pressure (BP) in hypertensive patients is controversial. This systematic review updated the previous reviews and evidence for it. METHODS: Ten databases were searched from their inception through October 2016, without language restriction. Randomized clinical trials (RCTs) were included if any types of ginseng were tested as the sole treatment or as an adjunct to other treatments for pre-hypertension or hypertension. The risk of bias (ROB) was assessed with Cochrane ROB tools by two independent reviewers. RESULTS: We found 528 potentially relevant articles, of which 9 RCTs met our inclusion criteria. Two studies reported positive effects of Korean red ginseng (KRG) on acute reduction of systolic BP (SBP: n=54, mean differences (MD), -6.52; P=0.0002; I2=0%) and diastolic BP DBP: MD, -5.21; P=0.0001; I2=0%), while two other trials failed to do so with north American ginseng (NAG) in both SBP and DBP. Five RCTs assessed the long-term effects of ginseng (KRG or NAG) on SBP and DBP. Two studies showed positive effects of KRG on reducing SBP and DBP compared with placebo (SBP: n = 183, MD, -2.92, P=0.04; I2 = 0%; DBP: MD, -3.19, P=0.008; I2 = 0%). CONCLUSION: This systematic review provides positive evidence for the efficacy of KRG on reducing blood pressure in patients with pre-hypertension and hypertension in acute and long-term. Future RCTs appear to be warranted. Copyright© Bentham Science Publishers; For any queries, please email at epub@benthamscience.org. KEYWORDS: Ginseng; blood pressure; hypertension; meta-analysis; placebo control; systematic review PMID: 28707603 DOI: 10.2174/1570161115666170713092701 [Indexed for MEDLINE]