The researchers note that the real impact of probiotics could be hidden by small sample sizes and a need for more focused research. “To explore the potential of probiotics to contribute to disease prevention in healthy people there is a major need for much larger, carefully designed and carefully conducted clinical trials,” Pedersen said.
“These should include ideal composition and dosage of known and newly developed probiotics combined with specified dietary advice, optimal trial duration and relevant monitoring of host health status.”
So, while there are benefits in certain situations, most people telling you about their great poops because of all the Kvass they drink just have naturally occurring, wonderful bowel movements. High five.