b12 injection makes me tired Why do I feel worse after a injection? Signs You Might Need B12

If effects persist beyond two weeks, consider reducing dose or consulting a healthcare provider

Molecular Genetics and Metabolism 98 (12): 173180

I wont bore you with the details, but suffice it to say that without adequate levels of cobalamin, a number of enzymatic processes dont proceed as they should

J Emerg Med 2012

Store lyophilized material at 4 F (20 C) or below Allow vial to reach room temperature before opening Protect from light, heat, and humidity Use sterile laboratory equipment during preparation Avoid repeated freezethaw cycles Label reconstituted samples with preparation date and concentration Following these practices helps support consistent and reproducible laboratory results