Vitamin B 12 deficiency is linked to low cortisol hormones in the body that can cause aggression in boys: https://www.webmd.com/balance/stress-management/news/

Vitamin B 12 deficiency is linked to low cortisol hormones in the body that can cause aggression in boys: https://www.webmd.com/balance/stress-management/news/20000113/stress-hormone-linked-severe-aggression-boys https://www.webmd.com/balance/stress-management/news/2000011... 4th rule of fight club: No biting