Are Gut Boosters BS? Supplement companies claim that prebiotics (which are one thing) and probiotics (another thing!) can strengthen immunity, aid weight loss, and even extend life. MELISSA MATTHEWS fact-checks all that. Read more... March 2, 2020 Gut Boosters prebiotic v probiotic PREBIOTICS prebiotics and probiotics what prebiotic means why use a prebiotic why we need prebiotic