feeling more tired after b12 injection I Feel All the Time. Do I Need a Shot?: Shawn Veiseh, M.D.: Family Medicine Benefits of Vitamin B12 Shots
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However, if you miss a medical appointment for your regular dose schedule, inform your healthcare provider as soon as possible

The activation of polyamine flux in adipocytes facilitated the polyamine acetylation reaction by using acetyl-CoA, ultimately leading to the loss of fat [44]
For example, concurrent use of chloramphenicol (an antibiotic) may attenuate the hematologic response to vitamin B therapy

Injections can be an effective way to ensure they receive enough of this vitamin.
doi: 10.18176/jiaci.0160

Front Physiol