Is plasma vitamin C an appropriate biomarker of vitamin C intake? A systematic review and meta-analysis

BackgroundAs the primary source of dietary vitamin C is fruit and to some extent vegetables, the plasma level of vitamin C has been considered a good surrogate or predictor of vitamin C intake by fruit and vegetable consumption. The purpose of this systematic review was to investigate the relationship between dietary vitamin C intakes measured by different dietary methods and plasma levels of vitamin C.MethodWe searched the literature up to May …