Advances in Nutrition, 2017 · Systematic review & meta-analysis
Across 22 randomised trials, beetroot juice lowered systolic blood pressure by about 3.6 mmHg and diastolic by 1.3 mmHg, more so in trials lasting two weeks or longer. Larger juice doses lowered it more, but juices higher in nitrate did not, suggesting nitrate is not the whole story.
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