Yes, as metabolic support and nutrition toody and the brain damaged with different noxes and with clinical pictures/manifestations of schizophrenias (Syndromas, not disease because unknown etiology!). We used B1, nicotinamide, B12 and folic acid, especially bz residual schizophrenias (chronic organic syndromas, Dementio praecox...)
See article on folate and vitamin B-12 status in schizophrenic patients available at http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3252772/#__ffn_sectitle. J Res Med Sci. 2011 March; 16(Suppl1): S437–S441
Or another article Homocysteine metabolism and B-vitamins in schizophrenic patients: low plasma folate as a possible independent risk factor for schizophrenia available at http://igitur-archive.library.uu.nl/dissertations/2006-1127-200553/c2.pdf