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Low serum B12 level but top of the range Active B12 level
Baseline vitals (BP/HR) and ongoing monitoring
If you have low B12 and are battling fatigue and/or depression, raising your B12 level back to normal can ease these symptoms and help you feel more energetic
Over many doses, the vacuum can become strong enough to suck air into the syringe when you try to draw, giving you an inaccurate volume