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This inherent protective quality is not confined to a single organ system but rather exerts a stabilizing influence across various tissues, providing the mechanistic foundation for its dual action in both the gastrointestinal tract and the central nervous system

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10.1161/JAHA.116.004328 86 LiuM.HeA.ChuJ.ChenC.ZhangS.HeY.et al (2018b)

Its possible to have "normal" levels on this test but still have a functional deficiency where your body can't actually use the B12 it has
