One of many proven ways to treat PTSD and other mental or physical health problems.
Cortisol can enter the brain and changes the neurotransmitters associated with PTSD symptom severity. Meaning that too much cortisol changes who a person is dramatically. Humans automatically become impulsive, aggressive & antisocial, and combat veterans usually never even understand what has happened to them. Worse yet cortisol can bind with our DNA, and change the expression of our genes to protect us long term. Books are written about the massive downstream negative effects of the body and mind, under excessive stressful situations.