Figure 7.

Serum cobalamin levels in the follow-up for both subgroups supplemented with natural (filled circles) or synthetic (open circles) B vitamins. Blood sampling: T1 = baseline—immediately before the first supplement; T2 = 1.5 h—subsequent to the first supplementation; T3 = 4 h; T4 = 7 h; T5 = 6 weeks (end of supplementation); and T6 = 8 weeks (washout period) from baseline. Data are presented as mean values ± standard error. Significant differences (p < 0.05) were indicated at the respective timepoints for natural supplements (^∗) and synthetic supplements (^#).