how much b12 is in an injection Vitamin Dosage for Adults: Guidelines B12 INJECTIONS - The Nurse

Last clinically reviewed: 31 July 2026 Clinical information sources NICE NG239 Vitamin B12 deficiency in over 16s: diagnosis and management NHS Vitamin B12 or folate deficiency anaemia NHS Diagnosis NHS Treatment MHRA Vitamin B12 and cobalt allergy advice This page provides general information about the pharmacy service and does not replace personalised advice from a pharmacist, GP or other healthcare professional

After that, the injection frequency usually shifts to a personalized maintenance schedule, which may be biweekly, monthly, or even as needed, based on how you feel and Dr

Oral vitamin B12 avoids an injection but still needs an appropriate product, dose, schedule and follow-up

The people who are at the highest risk of B12 insufficiency or deficiency are older adults, those with atrophic gastritis, gastrointestinal disorders, pernicious anemia, those who have had gastrointestinal surgery, vegans, and vegetarians

A sudden return to the maintenance dose is often ineffective, particularly when the patient was experiencing symptoms long before the diagnosis was made