Assertion: comfrey's alkaloid | /r/AtLocation | this plant
Facets:
Source sentences:
text: Most health regulatory agencies in the Western world have banned the internal use of comfrey due to the pyrrolizidine alkaloids found in this plant, which are known to harm the livers of animals fed diets consisting largely of comfrey leaves.
text: Most health agencies in the U.S. have banned the internal use of comfrey due to the pyrrolizidine alkaloids found in this plant.