Garlic Supplements for High Blood Pressure (Meta-Analysis)
Symptoms Studied
Elevated blood pressure readings, particularly systolic blood pressure above normal range, increasing cardiovascular risk.
Research Hypothesis
Garlic contains allicin and other compounds that may relax blood vessels, inhibit ACE activity, and reduce blood pressure through multiple mechanisms.
Intervention Tested
Garlic Extract
Garlic supplements in various forms (powder, aged extract, oil), doses varied across studies
Study Results
Before Treatment
Adults with elevated blood pressure, including those with diagnosed hypertension and those with pre-hypertension.
After Treatment
Meta-analysis of 17 trials showed garlic reduced systolic BP by 3.75 mmHg and diastolic BP by 3.39 mmHg. Hypertensive patients showed larger reductions (systolic -4.4 mmHg).
Timeline to Improvement
Blood pressure reductions observed across study durations of 8-24 weeks
Side Effects
Generally well-tolerated. Garlic odor, mild GI symptoms in some participants. May interact with blood thinners.
Source
- Garlic Supplements for High Blood Pressure (Meta-Analysis)
Wang HP, et al. J Clin Hypertens (Greenwich). 2015;17(3):223-231
Conclusion
Garlic supplementation modestly but significantly reduces blood pressure, with greater effects in people with hypertension. It may be a useful adjunct to lifestyle modifications.
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