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B-12, or cobalamin, is a vitamin essential for the proper functioning of the nervous system

If the injections were stored at room temperature, use them within 28 days (regardless if you transfer them to the fridge later) or before they expire

89 Surface modifications, such as PEGylation, have also been widely applied to improve brain-targeting efficiency after intranasal administration

While it might be easier said than done, the best thing you can do to prevent pain is to simply relax your arm or shoulder before the injection

Doctors generally dont order a B12 evaluation if theres no evidence of anemia (which would be picked up on a routine blood test)