best supplements to combat brain inflammation and reverse brain injury?

hi guys! so i have a next door neighbor who's kid ran into another kid playing baseball. hes about 12 and i believe he suffered a semi-serious brain injury as he was rushed to the hospital. with that being said, i ran into him (next door neighbor) and he told me all about it and how his kid was gonna come home that same night. this happened two days ago and i was wondering if there were any supplements that you would recommend so that my next-door neighbors kid can heal quickly and resume his life. thanks guys! anything is welcomed!