Question: how long does it take for yogurt to help diarrhea?
Answer: Probiotics might cut bouts of infectious diarrhea by half a day to about 2 days. Some research shows that the bacteria strains most likely to help are Lactobacillus reuteri, Lactobacillus rhamnosus, and the probiotic yeast Saccharomyces boulardii, although other strains might be useful.