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Subcutaneous B12 injections are a better choice when possible, and the front of the thigh is also best for this method
Patients with this condition cannot absorb B12 from food or oral supplements and require lifelong intramuscular replacement therapy
However, while you can get them through natural sources, some people are still not getting enough vitamin B12 daily (like vegetarians or vegans)
How often you need a B12 injection depends on a few things
Yue, X., Liu, S
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