Following up on my own comment, here is an article that talks about 2 placebo-controlled, double-blind studies that found a decrease in violence by adding multi

Following up on my own comment, here is an article that talks about 2 placebo-controlled, double-blind studies that found a decrease in violence by adding multivitamin supplements. https://www.psychologytoday.com/blog/evolutionary-psychiatry/201105/diet-and-violence https://www.psychologytoday.com/blog/evolutionary-psychiatry... So that's pretty good evidence for benefits, and it is certainly a relatively inexpensive intervention.