There’s a study on the benefits of Lysine for improving negative and general psychopathology symptoms in chronic schizophrenia posted by SzAdmin on this forum at: Amino Acid - L-Lysine - New Treatment for Schizophrenia - Has it Helped You? .
There’s also a study showing that SZ patients have decreased plasma ascorbic acid, and that supplementing with Vitamin C lowered their BPRS (Brief Psychiatric Rating Scale) scores, at: https://www.ncbi.nlm.nih.gov/pubmed/16133138 .
It’s a good combination, there’s even talk of it potentially reversing heart disease (according to Nobel laureate Linus Pauling.)