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In short, B12 injections work, but differently based on your starting point: For those with low levels
Most of the side effects of B12 injections are mild, including diarrhea or redness or temporary swelling at the injection site
User reports consistently mention mild headaches, particularly during the first week or two of use
Structured Medical Supervision Injections are typically administered under healthcare supervision, allowing better monitoring during B12 deficiency management
For most patients, a weekly B12 shot for the first four weeks rebuilds depleted B12 levels, followed by maintenance shots every two to four weeks
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