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Your healthcare provider will monitor you, especially with the first dose
Without intrinsic factor, B 12 absorption suffers
Prescription Requirements and Medical Supervision First, you need a doctors prescription for B12 injections
If you Google it this should come up
Understanding the timeline for B12 injections can help manage expectations and maximize results
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
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