where should i inject b12 Injecting Vitamin B12 Injection Sites: All

Monitor your overall health so that treatment stays appropriate and B12 is not masking another issue such as folate deficiency

Medical Members: Keep your coverage

Dosing information Usual Adult Dose for Pernicious Anemia: Initial dose: 100 mcg intramuscularly or deep subcutaneous once a day for 6 to 7 days If clinical improvement and reticulocyte response is seen from the above dosing: 100 mcg every other day for 7 doses, then: 100 mcg every 3 to 4 days for 2 to 3 weeks, then: Maintenance dose: 100 to 1000 mcg monthly Duration of therapy: Life Comments: Administer concomitant folic acid if needed

They may also repeat blood tests to assess vitamin B12 levels and other markers related to deficiency, helping determine whether the current injection schedule is meeting the patients medical needs

Cover the area with a bandage if desired

Medically Reviewed on 6/10/2026 Harvard T