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Spinal cord damage Spinal cord damage, known as myelopathy (problem with the spinal cord), is also associated with vitamin B12 deficiency
Less common, whole-body effects
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Our search of official Pfizer, FDA, and Health Canada sources through July 24, 2026 did not locate a product-specific counterfeit alert for Pfizer/Hospira bacteriostatic water
A low reticulocyte count can be a sign of B12 deficiency because the bone marrow cannot make red blood cells without B12
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