Hey yeah it is a very old recommendation to help those with a stutter but I believe only works for 30% of people. If you search Thiamin Protocol Stuttering some info will come up. However I can't recommend Thiamin at this time since its only offering me a temporary benefit.  What I've done tonight was order a full b complex to see how I do with that and also weaning myself off caffeine since B1 is water soluble and caffeine is a diuretic. I could be urinating out the vitamin too quickly.