Plants, trees and leaves are made for healing and where else than in the Jungle where you will find more species than anywhere else in the world. I believe there is a natural remedy for everything and who else would know but aboriginals and natives.
Indigenous people in India comprise an estimated population of 104 million or 8.6% of the national population. There are 705 recognised ethic groups there.
China is the country that has the biggest indigenous population. More than 125 million indigenous people. The Tibetans, Uyghurs, Zhuang and 52 other recognised groups still making up only 8.9% of the Chinese population. Aboriginal Australians (originating from a single human migration out of Africa) are the oldest civilisation. There are however more than a 100 uncontacted tribes living in the world today. The largest of them live in the Amazonian rainforest.