b12 injection form Shot Consent | ShesBackAtIt IM Injection Treatment Record Form
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This is where personalized dosing comes in

The FUT2 secretor variant p.Trp154Ter influences serum vitamin B 12 concentration via holo-haptocorrin, but not holo-transcobalamin, and is associated with haptocorrin glycosylation Hum Mol Genet 2017;26:4975-88
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Well, what oral supplements have in convenience, they lack in bioavailability

Slightly nauseous, first week no significant weight loss, but 2nd & 3rd wk 3 lbs each
