If we need to confirm whether vitamin C functions properly under a given clinical condition, what are the parameters to be considered in the case of human subjects? (Usually, it is custom to measure the vitamin C in plasma and intracellular compartments). Additionally, what is the significance of intracellular RBCs' Vitamin C content? (i.e. Suppose that intracellular RBC vitamin C level is decreased in a given clinical condition, can it affect any functions at systemic level?)
Thanking you in advance for sharing your experience.