Assertion: vitamin c | /r/HasProperty | involved in protein metabolism
Facets:
Source sentences:
text: Vitamin C is required for the biosynthesis of collagen, L-carnitine, and certain neurotransmitters; vitamin C is also involved in protein metabolism .
text: Vitamin C is also involved in protein metabolism , and it is an important physiological antioxidant  that can regenerate other antioxidants within the body, including alpha-tocopherol (vitamin E) .