The live bacteria and yeasts usually eaten in yoghurts or taken as food supplements were shown to modestly lower blood pressure when taken for two months or more in a review published in the American Heart Association journal Hypertension.
Researchers examined nine studies involving 543 adults with both normal and raised blood pressure.
They found that consuming probiotics lowered systolic blood pressure - the highest blood pressure reading when the heart beats - by an average 3.56 millimetres of mercury (mm Hg).
Diastolic blood pressure -the lowest level blood pressure reaches as the heart relaxed between beats - was lowered by an average 2.38 mm Hg, compared to adults who didn't consume probiotics.
Probiotics with multiple bacteria were more effective at lowering blood pressure than those with a single bacteria. The concentration of bacteria in a dose also affected results.
Dr Jing Sun, lead author and senior lecturer at Griffith University, Queensland, Australia, said: "The small collection of studies we looked at suggest regular consumption of probiotics can be part of a healthy lifestyle."