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It is not intended, packaged, or labeled for human injection, veterinary application, or any clinical use
Without testing, there is no way to distinguish between B12 deficiency and other causes of similar symptoms, no way to determine the severity of deficiency, and no way to select the most appropriate delivery method
B12...my shot was done in my arm...no pain at all
Research comparing routes of administration is ongoing and findings are mixed, so the practical difference for any individual patient is a question for their prescribing provider
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