pmc.ncbi.nlm.nih.gov/articl...
Our brains and myelin nerve sheath are made from a large amount of Docosahexaenoic acid, DHA. As we know vitamin B12 deficiency affect myelin building, leading to neuropathy.
To rebuild your brain and nerves make sure you are getting plenty of cold water oily fish in your diet, salmon, mackerel, anchovies, tuna, herring. If you can't stomach the idea of that, take a fish oil supplement.
As an aside, I noticed 'Psychology Today' was a bit hit and miss on it's vitamin B12 coverage. So for those of you that like campaigning, maybe it should be a target. All Psychologists need to know clearly about the function of vitamin B12 and the issues around clear deficiency diagnosis.