I would solidly say, no, i’ve been taking them for 6 months now intermittently. Cycling between Ash and L-Thianine to prevent tolerance… and so far so good! Like, there is this sense of calmness that wash over me when i take these pills, and i start thinking less of how other perceive me, therefore, i start to stutter less and less. I even use it with DAF when i have to do presentation and it gives amazing result. But i also practice meditation, relaxing technique to amplify the effectiveness even more. At the end of the day, it’s all come to a good diet, healthy and positive mindset + taking these pills, that are working for me.