Assertion: vitamin c's effect | /r/HasProperty | administered over 2.1 to 12 years
Facets:
value: individually
type: OTHER
Source sentences:
text: A 2012 review of nine randomized controlled trials found no substantial effect of β-carotene, vitamin C, and vitamin E, administered individually or in combination over 2.1 to 12 years, on the risk of cataracts or cataract surgery (112).