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b12 injections potassium Hydroxocobalamin (B12) Injection, 2mg/mL Vitamin B12 Shots: Uses, Intake
Description
doi:10.1016/j.bcp.2019.02.008 Dimet-Wiley A, Latham CM, Brightwell CR, et al

Vitamin B12 is water-soluble, so excess amounts are generally excreted in the urine

It binds plasma proteins more tightly and is retained far longer, which is why a single dose holds therapeutic levels for roughly eight to twelve weeks and supports a maintenance interval of two to three months
Its not clear if HMO have more functions than feeding the gut microbiome

Sep 2013;65(9):1077-82

Mandrini S, Comelli M, Dall'angelo A, et al