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Even considering all of these factors you need to understand that checking vitamin B12 levels in the serum still isnt the best way to evaluate for B12 deficiency
It largely depends on how early you catch and start treating the B12 deficiency
Discard the pens after 28 days even if they are not expired
Ensuring proper administration technique (IM deep into muscle, or IV slowly diluted) also helps minimize adverse effects like injection pain or vein irritation
Ever just relaxed and then felt one of your muscles start twitching on its own
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