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100 mM Na2SO4
How to prevent vitamin B12 deficiency Vitamin B12 deficiency due to diet is rare in the U.S

10.1016/j.abb.2022.109149 57 PacittiD.ScottonC

PMID: 25189395

However, because dietary groups differed prior to intervention, the study cannot fully disentangle prebiotic effects from those attributable to the pre-existing diet
