Jeez, substances that have healed people for centuries are bad, but brand new injectable snake oil is safe and effective.
Clown world: Don't do your own science or medicine
Mfs included comfrey on this...
https://www.washingtonpost.com/wellness/2023/02/06/kava-lobelia-supplements-to-avoid/

Discussion
Well, of course, can't grow injectable snake oil in your own backyard. Can't have the plebs thinking they can heal themselves, they might realize they don't need the system and get uppity