Assertion: comfrey's use | /r/HasProperty | controversial
Facets:
value: due to the presence of pyrrolizidine alkaloids
type: CAUSE
value: a bit
type: TEMPORAL
Source sentences:
text: Today its use for animal and human food is controversial although people and animals have been eating it for centuries.
text: Its internal use is a bit controversial, as the U.S. Food and Drug Administration has issued warnings about comfrey’s pyrrolizidine alkaloid content, which can cause liver damage at high doses, but you’ll find herbalists recommending its limited use as a tea as well as in topical applications.
text: Comfrey’s use internally is controversial due to the presence of pyrrolizidine alkaloids (PA).