Way before painkillers and antibiotics were even a thing, humans believed that eating corpses and drinking human blood could cure them of their daily ailments. Practiced in the 17th century, this horrifying practice is now known as medicinal cannibalism.
Doctors would grind up parts of a corpse into tinctures or powders which would then be used to “cure” bleeding, headaches, and other ailments. King Charles II even had his own signature mixture called the King’s Drops, which contained alcohol and powdered human skull.