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This is a real tension that any serious longevity clinic has to navigate

Zhang M, Gao S, Yang D, Fang Y, Lin X, Jin X, et al

doi: 10.1038/nature07240
Molecular docking studies revealed hydrogen bonding interactions with the amino acid residues Arg880, Lys771, and Thr1010

In this case, the body is absorbing enough B12, but it is unable to use it

I mean, with the gut, we start off by doing testing and we find stuff that needs to be fixed, and we fix it often with supplements or sometimes medications
