This is fascinating. Because I had the same experience with fatigue and vitamin D. I feel like a superhero on the high dose they give you when it's low but you physically cannot take that much all the time for other health reasons because it stresses organs if I remember right? I'm sure someone is likely to correct me. so I could see B1 also not being sustainable for this. It's interesting to know the connection between the vitamin and the function. Edit: it looks like for this vitamin it wouldn't be unsafe per se. But it sounds like you got a tolerance for it or as others suggested maybe the power of suggestion wore off. Never tried taking any supplement for stutter! I do wonder if believing it would hel