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(4) In the clinical evidence-based analysis, 3 randomized controlled studies reported that oral vitamin B12 supplementation was as effective as vitamin B12 intramuscular injections in treating patients with vitamin B12 deficiency

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The vaccine fact sheet says this: Immunocompromised persons, including individuals receiving immunosuppressant therapy, may have a diminished immune response to the Pfizer-BioNTech COVID-19 Vaccine

It cannot prove the medication is free of bacterial endotoxins
