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Hydroxocobalamin 1mg intramuscular injections reactivate metabolic pathways after chronic deficiency, potentially causing temporary symptoms during adjustment Common side effects include injection site pain, headaches, and nausea, typically resolving within 2472 hours Rapid red blood cell production may increase demand for folate and iron, occasionally creating relative deficiencies in these co-factors Serious reactions requiring urgent assessment include difficulty breathing, chest pain, severe weakness, or progressive neurological symptoms Recovery follows a predictable pattern: blood cell improvement within 35 days, haemoglobin normalisation over 12 months, neurological recovery potentially taking several months Table of Contents Why Do I Feel Worse After My B12 Injection
Many healthy adults can maintain normal B12 levels through a balanced diet that includes animal-based foods or fortified products
For some individuals, the effects of a B12 injection may be more subtle or gradual, while for others, the effects may be more immediate and noticeable
The information contained herein is not a substitute for and should never be relied upon for professional medical advice
Sharma A, et al
