I don’t know how long it takes for psyllium fiber to work in removing polyps from the colon. If you suspect you may have polyps in your colon now because you have not been consuming enough fibers in your food intake, then it is never too late to start taking psyllium fiber now at a maximum dosage. In my case, it took several years between my first and second colonoscopies. In between those two periods I was taking psyllium fiber about ten years before my second colonoscopy. So obviously, the ten year period was a good amount of time that psyllium fiber worked on removing the polyps from my colon. In your case, assuming you do have polyps, one year may not be sufficient time for psyllium fiber to work its magic on your colon. But it is never too late to get started on it and continue with it even after the colonoscopy procedure. If your colon shows negative for polyps, it is still good to be on the psyllium regimen to prevent the growth of them as you grow older.