This new meta-analysis included nine clinical trials with 543 participants. Probiotic species used were varied among the trials, and the studies lasted three to nine weeks.
The reductions in systolic and diastolic blood pressure were approximately 3.5 and 2.4 mmHg, respectively, although investigators observed larger reductions among individuals with elevated blood pressure at baseline and those who consumed multiple probiotic species.
For those who ate more than one probiotic species, the reduction in systolic blood pressure was 5.8 mmHg. Those who consumed probiotics for more than eight weeks had a 4.9 mmHg reduction in systolic blood pressure.
"These findings, along with results from [another] meta-analysis on the beneficial effect of probiotics on the lipid profile, suggest that probiotics may be used as a potential supplement for future interventions to prevent hypertension or improve blood pressure control," conclude the researchers.
Future studies are needed, however, to clarify the effects of different products with different probiotic species on blood pressure. Mechanistic studies are also needed to determine how probiotics reduce blood pressure, they write.
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Source: Effect of probiotics on blood pressure: a systematic review and meta-analysis of randomized, controlled trials
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