I've been trying b1 and magnesium. Only for a couple of weeks. I read online that magnesium is a common anxiety treatment so thought I could maybe atleast placebo myself a little bit even if it doesn't genuinely work. I think my overall anxiety is slightly decreased but my stutter seems to be the same. And my urine was fluro yellow so I have an excess of B1. Just the other day I made my wife burst out laughing after I got stuck on a word and broke the stutter by saying "that magnesium ain't doing shit!" haha But saying that. I think there's many different causes of stutters and maybe mine just isn't affected by magnesium or B1. I wouldn't want to discourage anyone from something that might work for them.