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However, vitamin B 12 deficiency does not generally develop until after at least two-to-three years of continuous therapy (137-139)
Use the protocol-specified site, angle, and device
If you often feel tired despite sufficient rest, it might be worth considering your B12 levels
Track your dose progression against these numbers to know exactly when you will need your next vial
Subcutaneous, intramuscular, and even oral routes all show effect, though injectable routes generally show better uptake and more predictable results
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