Which bacteria truly qualify as probiotics?

(International Scientific Association for Probiotics and Prebiotics) Today, the word probiotic is used to describe all kinds of 'good' microorganisms in foods and supplements. Already, scientists have come up with a specific definition of probiotics, however, they have agreed that for a bacterial strain or strains to be called a probiotic, it should follow four simple criteria. Correct use of the term probiotic, per these criteria, will give consumers better transparency about the benefits when ...