b12 injections not being absorbed Vitamin Absorption Post Gastrectomy – Human STEAM Pernicious Anaemia: When Your Body
Description
preparation of certain cations of Formulas I and IA may occur by alkylating the N-positions of the quinoline scaffold using, for example, iodomethane or methyl trifluoromethanesulfonate (see Scheme 1)

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Janvier S, Sutter ED, Wynendaele E, Spiegeleer BD, Vanhee C, Deconinck E

Not having enough intrinsic factor, a stomach protein needed for B12 absorption
The B vitamins should not get near freezing temperatures
IF is produced by parietal cells of the stomach and is essential for the transportation and absorption of vitamin B12 in the terminal portion of the ileum 2