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doi:10.1093/ajcn/86.5.1302

B12 plays a key role in several processes like producing red blood cells, converting food into energy, and producing nerves

One such piece of research is a 2020 review published in the journal Nutrients (1)

(9) That refers to oral intake, not to the blood level

The compounded formulation offers flexibility in dosing regimens, as determined necessary by the patients prescribing physician, with various concentrations available to accommodate different patient needs and treatment protocols

Semaglutide was present in the milk of lactating rats and was detected at levels 3- to 12- fold lower than in maternal rat plasma