Learner1
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There seem to be some differences in study results...these studies do say IVC results in higher blood concentrations than oral.
As mentioned above, the uptake of oral ascorbate in humans is tightly controlled by the gut and kidney filtration [7]. Rats receiving ascorbate by gavage (0.5 mg g−1) increased blood and extracellular concentration to peak levels <150 μM [10]. By contrast, concentrations reached peak levels of nearly 3 mM in rats receiving intraperitoneal injections, while intravenous injection increased peak levels to >8 mM. In a similar study, mice receiving bolus intravenous injections of ascorbate (1 g kg−1), resulted in plasma concentrations of 15mM [164]. Supplementation of ascorbate in drinking water at 1 g kg−1 only increased
plasma concentrations to <50 μM. These results clearly indicate that pharmacologic
concentrations of ascorbate cannot be obtained by oral administration.
Just as important, our data show that intravenous administration of vitamin C produces substantially higher plasma concentrations than can be achieved with oral administration of vitamin C.