self-administered vitamin b12 injections Shots at Home: How, Where & How Often to Inject Yourself How to Inject Vitamin B12
Description
Rare side effects: itching, exanthema, chills, fever, hot flushes, nausea, dizziness, and very rarely anaphylaxis

[2] [3] This may temporarily cause symptoms such as fatigue or headaches in some individuals

Intravenous administration might be better in some cases

For cohort 1, the ODB database was used to identify patients who were prescribed vitamin B12 injections
