Full study : [https://www.academia.edu/38185003/Thiamin\_Protocol\_by\_Martin\_F\_Schwartz\_pdf](https://www.academia.edu/38185003/Thiamin_Protocol_by_Martin_F_Schwartz_pdf) B1 / thiamine was recommended in the 1950's for stuttering in the US: This is the research from 1955 : [https://ufdc.ufl.edu/UF00098033/00001](https://ufdc.ufl.edu/UF00098033/00001) with the conclusion there is no significant difference between those who where administerd thiamin and those with a placebo. So in the 60's they stopped with B1 for stuttering, after the advice of some health department in the US. <not a doctor>Be critical while reading. Study is not based on actual scientific proof and/or double-blind study. B1/Thiamine is also a water solvable vitamin, so classical medicin would state your body is unable to hold more B1 then you need. (therefore deus ex machina, the magnesium) </ not a doctor> I've tried it myself with no result. But that doesn't mean it can work for others. Don't forget that placebo's are a powerfull drug. Once again, I am not a doctor and I have NO medical background