Been taking it for years. It works to calm anxiety but stuttering is basically a mind game. I am now fluent after 50 years of stuttering. It took a lot of hard work and it has no magic pills, but fluency is there. My reddit group is r/StopStuttering Mind training and several techniques is one way to beat it. If anyone wants more info, please direct message me. I am not self promoting. I do this for free. I do not make a dime. If you want to stop, I can help you.