I just read that the pectin in prune juice is a prebiotic (pectin.) I thought for sure the container said so, but I can't find it. Had to go to the internet.Psyllium husk is the same fiber that they put in Metamucil. Wile it does add bulk to your stools, it is not one of the prebiotic fibers that our gut bacteria can use . It does help to soak up toxins and get them out of the body, and also unwanted dietary cholesterol, but it is important to get the prebiotic type of fiber as well, like we get from foods like whole grains and legumes, fruits and veggies.