I think it depends on your type of stutter. My stutter is probably from anxiety and social situations like talking to strangers, new people or presentation. For ex. when I am drunk I dont stutter at all - zero. So thats why l theanine and ashwa can help you because they lower your cortisol (stress level) which causing you to stutter in lot of these situations. However, if your stutter is different type, then I think nothing from these meds can help, maybe a little.. who knows, try it and you will see :) GL