Assertion: comfrey | /r/MadeOf | vitamin b12
Facets:
Source sentences:
text: Comfrey contains many vitamins and nutrients such as Vitamin B12, potassium, sulphur, calcium, iron, phosphorus, Vitamin A, Vitamin C, Vitamin B-complex, selenium, iron, germanium and is also an excellent source of protein.
text: As comfrey is a high protein (22-36%) that also contains vitamin B12, leaves can be a valuable addition to a vegetarian diet, as there are not many plant sources of B12.