can a b12 injection give you a headache Why do I feel worse after injection? Vitamin B12 Injection Side Effects

Product availability at the time of dispensing may vary due to supply chain conditions

Undetected vitamin B12 deficiency due to false normal assay ...ncbi.nlm.nih.gov articles PMC3827408 by E Scarpa 2013 Cited by 25 Although measurement of vitamin B12 levels is the gold standard for the diagnosis of B12 deficiency some reports do exist concerning difficulties in its assay

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Unlike sterile water for injection (SWFI), which must be used immediately after opening and discarded after a single withdrawal, bacteriostatic water can be stored and reused for up to 28 days after initial penetration of the vial stopper