I've been taking it the last 2 weeks and have seen very considerable results. I was a skeptic at first, hardly believing it has any effect. My stutter is still far from gone but is much more manageable than before. Would really recommend research into it, might be a key link to helping combat stutters. I take a single 100mg pill a day and it works within half an hour. I've been using it for university and it's really made me more confident in contributing in class and giving presentations.