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is vitamin b12 injection considered a supplement Injections: What You Need To Know Vitamin B Injections: Fast-Acting Energy,
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They would also use the administration code and the diagnosis code Z23 (Encounter for immunization) to showcase the vaccine administration was for immunization purposes

Observed effects in human trials Reported adverse events across the IV and oral trials included headache, fatigue, dizziness, nasopharyngitis, diarrhea, flatulence, increased appetite, nausea, and back pain

doi: 10.1016/j.cmet.2010.09.004

Major health organizations do not recommend B12 for weight loss in healthy individuals
