Doctors recommend that vaginal and oral administration of Lactobacilli help in the treatment of bacterial vaginosis. There is still some evidence required to recommend it over other medical approaches. However, women who consume probiotics report improved vaginal health and are also likely to encounter fewer pregnancy-related complications resulting due to bacterial vaginosis.
Further, there’s still a lot we don’t know. A recent study published in Cell compared how the microbiome of the gut reconstituted itself after antibiotic treatment with and without probiotic administration. The researchers found that probiotics (which might have improved diarrhea symptoms) led to a significant delay in microbiome reconstitution, if it occurred at all. And — again — this study was with purified strains of bacteria, which is not what you’re getting in probiotic-containing food.