GABA or dopamine for stutterers?

GABA or dopamine for stutterers? Have read reviews that GABA actually help stutterers, like xanax and valium which increase GABA and dopamine? I took GABA combined with L arginine and it relaxes me good. A significant finding in mice suggests that when L-arginine is administered in combination with GABA, there is an increased efficacy x 10 times.