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How to inject vitamin B12 in your arm Instructions to inject vitamin B12 into your arm B-12 injections are often given in the arm and especially, in medical terms, the deltoid part of the shoulder
Some other exposures (eg, use of proton pump inhibitors, H2-receptor blocking agents, or metformin) might raise suspicion that this was a significant or sufficient cause, but by itself is not sufficient proof that such an exposure actually caused a vitamin B insufficiency
Repeat determinations of iron and folic acid may reveal a complicating illness that might inhibit the response of the marrow
Some of these claims have clinical grounding, while others stretch the evidence considerably
How do I know if I need B12 supplementation
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