Psyillium husk versus probiotics

They serve fundamentally different purposes in your body. Probiotics are beneficial bacteria that can aid in digestion, immune support, and urinary tract health, among other things. Psyllium husk is an indigestable fiber that can be taken in large amounts to stimulate a bowel movement. Which one you need depends on your goals.

As a fiber, I really dislike psyllium, though. Compared to other fibers (such as acacia, for example) it's much more violent, doesn't dissolve well in liquid, and can cause your bowel to start to become dependent on it if you use it long-term.