Here is a very bad example of a snake oil salesman who said insulin is poison. Keep this in mind should you ever see magic cures that are quite contrary to modern medicine (but that being said I really wonder what part of our modern medicine will be proved to be complete junk or worse in another 100 years):
https://www.washingtonpost.com/nation/2019/02/26/year-old-died-after-being-told-not-take-insulin-now-herbalist-is-headed-jail/When Edgar Lopez died in August 2014, the 13-year-old weighed just 68 pounds. For two days, his condition had been rapidly deteriorating, and he had gone from being unable to keep food down to struggling to breathe. His eyes were fixed in place and his skin felt cold to the touch, his father, Delfino Lopez Solis, told jurors as he broke down sobbing in court earlier this month.
But even as he wasted away before their eyes, Lopez’s parents hesitated to call 911. They had been told that the insulin that their son was supposed to be taking for his Type 1 diabetes was poison, Solis testified. Timothy Morrow, a herbalist based in Torrance, Calif., had instead told them to rub lavender oil on the boy’s spine and prescribed herbal medicine that he claimed would cure Lopez for life.