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However, this association does not imply causationelevated B12 often serves as a biomarker for serious underlying disease rather than being directly harmful

[DOI] [PMC free article] [PubMed] [Google Scholar] 140.Ahmadian M, Abbott Marcia J, Tang T, Hudak Carolyn SS, Kim Y, Bruss M, et al

Peptide adhesion to syringe walls reduces effective dose by 58% over 24 hours

Intramuscular shots put B12 right into the muscle
