Assertion: comfrey's pyrrolizidine alkaloid | /r/CapableOf | harm the liver
Facets:
Source sentences:
text: In addition to healing components, most comfrey plants contain toxic substances known as a pyrrolizidine alkaloids (PAs), which can harm the liver when ingested.
text: Even though comfrey is a useful herb, it contains poisonous compounds called pyrrolizidine alkaloids that can harm the liver if ingested or even absorbed through the skin in unsafe quantities.