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is b12 injection intramuscular subcutaneous vs.intramuscular b12 injections im or sq Subcutaneous (SC) and (IM) Injections– B12 Injections at Home -
Description
The head-by-head comparison between the three interventions was made only in one paper of the included studies

Efectos metablicos antiinflamatorios : En modelos de investigacin relacionados con la obesidad, la administracin de 5-Amino-1MQ se ha asociado con una reduccin en la expresin de citocinas inflamatorias en el tejido adiposo
Self-Injection Self-administer vitamin injections at home

Integrative medicine (Encinitas, Calif.), 13(2), 815

Neelakantan 2018 diet-induced obesity study

Unless the argument is that those people can access their B12 stores and you cannot, but I don't think we can assume that
