Two studies suggest that thiamin (vitamin B-1) may reduce stuttering. One study was of children; the other study investigated adults who stutter. The Hale Study A 1951 study[ref]Hale, L. (1951). A consideration of thiamin supplement in prevention of stuttering in preschool children. Journal of Speech and Hearing Disorders, 16:4; 327-333.[/ref] investigated thiamin with an unspecified [...]