a postbiotic is ‘a preparation of inanimate microorganisms and/or their components that confers a health benefit on the host’. That’s how the International Scientific Association of Probiotics and Prebiotics (ISAPP) defined the term in a statement released earlier this year. It was about time, too. As scientists have gradually gained a better understanding of the workings of the gut microbiome, there’s been a grey area when it comes to defining exactly what it is that postbiotics do.
ISAPP added that effective postbiotics must contain inactivated microbial
