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It is not FDA-approved as a product the way brand-name versions are, and quality depends on the pharmacy, which is why provider sourcing matters
mercury, lead, arsenic, cadmium, manganese, and iron
Serious but rare complications: Hypokalaemia: Rapid B12 replacement in severely deficient patients can precipitate potassium depletion during haematopoietic recovery, potentially causing cardiac arrhythmias
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