I think if the stuttering is a result of a childhood trauma aka not hereditary you absolutely can cure it, though it's not the case if it's hereditary, i got my stuttering from my mom and she was a stutter until the last day of her life, so I know there's something in my brain causing me to stutter. Though i believe you can do some experiments and what happens, i think if you increase growth factors in the brain you can improve the stuttering, go and check a really good YouTube channel called 'leo and longevity' and search in his channel for 'growth factors' , just don't be afraid to try.