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Research Question:
Swallowing garlic supplements lowers the blood pressure?

Study Design:
This overview article contained 17 Rcts.

Results and conclusions:
The researchers found that garlic supplements the systolic blood pressure significantly with 3.75 mmHg [95% CI =-5.04 to-2.45, I2 = 30.7%, p 0.001] reduced.

The researchers found that garlic supplements the diastolic blood pressure significantly with 3.39 mmHg [95% CI =-4.14 to-2.65, I2 = 67% p 0.001] reduced.

The researchers found in the subgroup analysis that garlic supplements the systolic blood pressure in patients with high blood pressure with 4.4 mmHg [95% CI =-7.37 to-1.42, I2 = 0.0%, p = 0.008] reduced, but not in people with normal blood pressure.

The researchers found in the sensitivity analysis in which the heterogeneity disappeared, that garlic supplements the diastolsiche blood pressure in patients with high blood pressure significantly with 2.68 mmHg [95% CI =-5.99 to-0.42, I2 = 0.0%, p = 0.020] reduced.

The researchers concluded that garlic supplements reduced blood pressure, especially in people with high blood pressure.

Original title:
Effect of Garlic on Blood Pressure: A Meta-Analysis by Wang HP, Yang J, [...], Yang XJ.

Link:
http://www.ncbi.nlm.nih.gov/pubmed/25557383

Additional information about El Mondo:
Find here more studies on garlic and prevent high blood pressure.
Read more about overview article, Rcts, 95% CI and subgroup analysis.