Assertion: comfrey's toxicity | /r/HasProperty | due
Facets:
value: to the herb
type: CAUSE
Source sentences:
text: A study published this year in the Journal of Public Health Nutrition reviewed the biology of comfrey, explaining that this toxicity is due to the herb containing pyrrolizidine alkaloids (PAs), which are then thought to be converted into highly reactive pyrolles that can damage the liver and certain other organs.