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Some people have trouble absorbing B12 through the gut due to conditions like pernicious anemia or gastrointestinal surgery

doi: 10.1016/j.bbamcr.2006.12.006 43 BotelhoHMKochMFritzGGomesCM

While previous studies employing single-cell RNA sequencing have indirectly suggested the importance of NF-B for tissue-resident memory (151, 170172), our research demonstrates that NF-B signaling is crucial for memory diversity and T cell-mediated immunity (169), ( Figure 3E )

The genetic test identifies predispositions in pathways like MTHFR, methionine synthase, and cobalamin transporter variantsfactors that may influence how effectively you utilize injected B vitamins