First of all, what are probiotics? While they are generally described as “good bacteria,” the World Health Organization officially classifies probiotics as “any living microorganism that has a health benefit when ingested.” Many types of bacteria (such as the more commonly known L. Acidophilus and Bifidobacteria) are probiotics and even some types of yeast (such as Saccharmyces) can act as probiotics. And what health benefits do these microorganisms provide?