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subcutaneous vs intramuscular b12 injections injection vs.intramuscular b12 im or sq Subcutaneous (SC) and (IM) Injections– What happens if you inject
Description
[DOI] [PubMed] [Google Scholar] 271.Wu C.-H., Huang T.-C., Lin B.-F

Peptide therapy uses targeted amino-acid sequences that mimic or influence natural hormones and growth factors in the body, delivered most often by subcutaneous injections, occasionally by oral or other routes depending on the molecule

Methyl B12 is a natural type where the other one is synthetic

[1] [2] B12 injections are primarily prescribed for patients with pernicious anaemia , an autoimmune condition where the stomach cannot produce intrinsic factor, a protein essential for B12 absorption in the gut