is b12 injection intramuscular subcutaneous vs.intramuscular b12 injections im or sq Subcutaneous (SC) and (IM) Injections– B12 vitamin Store How to
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Unless the argument is that those people can access their B12 stores and you cannot, but I don't think we can assume that

Neelakantan 2018 diet-induced obesity study

Importantly, this does not automatically mean injections oral supplements are appropriate for the majority of older adults

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Sensitivity to B Complex Vitamins Some people react to B vitamins, but its not necessarily an allergy
