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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

in some countries grain-based foods, such as bread and pasta, are fortified with B 12

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

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

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