Assertion: vitamin b12 | /r/HasProperty | difficult
Facets:
value: often
type: DEGREE
Source sentences:
text: So, if the mushrooms are farm-cultivated, they do add a modest quantity of vitamin B12, which is often difficult for strict vegetarians to obtain and it is the same type of bio-available B12 as found in meats and seafood (meaning that it can be used by the body).