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So, you measure a higher B12, but part of that B12 is inactive, so useless Oral B12 supplementation, even in the form of a multivitamin preparation, may result in serum B12 concentrations just within the normal range without abolishing symptoms

Myelin functions as a protective layer coating the outer membranes of nerve cells, insulating them and helping to enhance electrical impulse speeds between various nerve cells

So, unless youre deficient, megadoses of vitamin B12 may be just passing through your body and making some organs work harder (NIH-a, 2021)

Even though you are taking vitamin B12 supplements or injections, it is also good to maintain a healthy diet