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Prepare injections in a clean area, use aseptic technique, disinfect vial stoppers, and use a new sterile needle and syringe for every preparation and administration
Severe kidney disease, where dosing should be monitored because the kidneys clear excess B12
B12 deficiency may cause nerve damage, such as numbness and tingling in the hands and feet
They are usually compared based on research focus rather than a strict better-or-worse hierarchy
These reference points come from preclinical literature and small pilots
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