Results of serum levels of holotranscobalamin, methylmalonic acid, vitamin B12, and vitamin D (25-OH-vitamin D2/D3) before and after intervention. SD = Standard deviation; p-value (baselines) indicates comparison of values at baseline (results from t-test or MWU-test). p-value (end) indicates comparisons at the end of the study adjusted for baseline values (results from ANCOVA). p-value (baseline-to-end) indicates comparisons of changes from baseline to end of study (results from mixed ANOVA). Statistically significant results are bolded.