oak bark

hi, I have a cousin who was hopeless because a brain tumor since more than three years ago, his mother every day going to see him in hospital and without doctors noted she gaved him a tea called oak bark, today my cousin is healthy and for my family that was very useful remedy, not to be taken for a long time or in large quantities because it becomes toxic.

I dont know what containing but is very effective.

My aunt has always been a great connoisseur of herbalism and not lose anything by trying. regards