Plasma vitamin C concentrations were also analyzed on days
7 and 14. Plasma vitamin C concentrations remained elevated
(P < 0.05) during the study (Table 2). However, no significant
differences were observed between the men and the women
except at baseline. There was a significant sex-by-time interaction
for bioavailability of vitamin C (P = 0.001). Interestingly,
although the concentration of vitamin C at the end of the study
(day 14) remained significantly higher than at baseline, it tended
to be lower (although not significantly so) than the concentration
reached by drinking the juice all in one dose (500-mL dose compared
with two 250-mL doses).