There is no cure for PTSD. It is not a disease as such that a plant can cure. PTSD is a psychological state and in the new DSM when it is written, there will most likely be a section for PTSD which comes about from service in a combat zone and this form of PTSD is similar to someone who has been held captive. i.e multiple traumas.
Just think, people can experience PTSD from a motor vehicle accident. And just think, they can go to therapy for years and still not fully recover from that one trauma. So what hope do we have surviving and experiencing trauma, after trauma, after trauma.
PTSD will forever be our beast of burden, we just have to learn how to manage it better so we can lead a semi normal life.
But if it works for you mate, try it.