Healing plants? What about the "Tree of Life" in Eden? Or the Prophecy in Revelation the 7th day Adventists featured? Rev. 22. [2] In the midst of the street of it, and on either side of the river, was there the tree of life, which bare twelve manner of fruits, and yielded her fruit every month: and the leaves of the tree were for the healing of the nations."
Opium Poppy was prized since ancient times. Alexander the Great used it for his armies. It not only stops pain, it also stops dehydrating and dying from uncontrolled diarrhea common from polluted water in ancient times. Common in medicine cabinets around the world until modern times.