how soon does vitamin b12 injection work Injections: What You Need To Know How Long Does It Take
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What are the symptoms of pernicious anemia (PA)

10.1038/s41598-018-22081-7 67 KaplanP.TatarkovaZ.SivonovaM

Here is why clients choose treatment: Experienced Providers: Injections are administered by trained professionals

You can always ask for followup training with your RN.

Heres the kicker: blood serum B12 tests are unreliable , especially in people who have been supplementing (even just with a multivitamin)