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In my own practice, especially if an older person has risk factors for vitamin B12 deficiency, I consider a vitamin B12 level of 200-400 pg/mL borderline, and I usually order a methylmalonic acid level as a follow-up
Jelovac, N., Sikiri, P., Rucman, R., Petek, M., Perovi, D., Konjevoda, P., Marovi, A., Seiwerth, S., Grabarevi, Z., Sumajstorci, J., Dodig, G., & Peri, J
Considering these factors, we strongly encourage patients interested in vitamin B12 injections to schedule a consultation with our experienced healthcare professionals
A brief head rush or lightheadedness right after injecting resolves in minutes and isn't a concern
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