Taking 2 milligrams or less a day of vitamin B12 in supplements is unlikely to cause any harm.
[DOI] [PubMed] [Google Scholar] Sterne 2011 Sterne JA, Sutton AJ, Ioannidis JP, Terrin N, Jones DR, Lau J, et al
How to inject Vitamin B12
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Proper reconstitution with bacteriostatic water and appropriate storage are essential