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mixing vitamin b12 in injection Injections: Good or Bad? B12 Shots vs. IV Infusions:
Description
This will minimize your risk for unexpected reactions, that you might then blame on the B12 itself

He Y, Sun MM, Zhang GG, Yang J, Chen KS, Xu WW, Li B

In summary, whether used before or after drinking, B12 shots can be a useful tool in managing hangover symptoms

B12-gives you more energy and boosts your metabolism, helping you shed unwanted pounds
