Assertion: collagen | /r/Causes | allergic reaction
Facets:
value: in some very rare cases
type: OTHER
Source sentences:
text: However, collagen may cause an allergic reaction or digestive side effects such as heartburn, diarrhea, and constipation.
text: In some very rare cases, collagen may cause an allergic reaction, resulting in irritation of the skin or extreme swelling.