Garlic supplements definitely lower blood pressure and decrease the risk of dying from a heart attack
Garlic supplements may lower blood pressure just as effectively as some commonly prescribed drugs used to treat hypertension according to a review of 11 modern studies. Research to date on garlic and blood pressure was "inconclusive" and only used older studies done up until 1994. The new meta-analysis - in which the results of several studies are analyzed collectively -- included more up to date research. According to the authors of the research review, Dr. Karin Ried and colleagues from The University of Adelaide in South Australia "Supplementation with garlic preparations may provide an acceptable alternative or complementary treatment option for hypertension,"
To provide an updated perspective, Ried and her team included more recently published studies in their analysis, identifying 11 studies in which the patients were randomly assigned to garlic or placebo. In most studies, participants given garlic took it in capsule-powdered form. Doses ranged from 600 mg to 900 mg daily, which study participants took for 12 to 23 weeks.
When the researchers pooled the data from the trials, they found that garlic reduced systolic blood pressure (the top number in a blood pressure reading) by 4.6 mm Hg, on average. When the analysis only included people with high blood pressure it showed garlic reduced systolic blood pressure by 8.4 mm Hg on average, and diastolic blood pressure (the bottom number) by 7.3 mm Hg. The higher a person's blood pressure was at the beginning of the study, the more it was reduced by taking garlic; garlic became increasingly more effective in those with more elevated blood pressure. These results mirror the effects on blood pressure reduction achieved through the use of beta-blocker drugs and also by ACE inhibiting drugs and the amount lowered by garlic can decrease the risk of developing heart disease or dying from a heart attack by a considerable 20%. The study is published online ahead of print in the journal BMC Cardiovascular Disorders.