Why Don’t YOU Know This

Comfrey!
Y’all I’ve been growing food now for over a decade. ( crazy when I say it like that.) The one question I’ve asked is “ why don’t /weI know about this plant?”
Food/medicine literally grows under our feet for free. Yet we fallow a system that has its own “ people washing poison off their food?”
This makes no sense to me.
Why don’t you know about comfrey?
Is it the same reason we allow other natural medicines/foods to be demonized?