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Heres how: B12 is essential for nervous system health , which supports sexual function

Intrinsic factor is a protein needed so that B12 can be absorbed

A hyper-responsive immune system explains flu-like symptoms

It may be difficult to determine the exact time when your vitamin B12 injections have started working, as many people will report noticing a difference in their energy levels within a few days following the shot, and others may not feel the increase in energy for multiple weeks if their body needs the vitamin to build up a bit more

It might be more than just a hectic schedule you could be dealing with a vitamin B12 deficiency