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Which B12 symptoms are exclusive to B12 def.? Would demyelinization cause a lot of overlap? Are there symptoms of MS that are not caused by B12 def.? New symptoms, but have one MTHFR gene (heterogeneous). Can't help but wonder whether B12 treatment is ineffective even though serum levels increased f...

Had low B12 (220 pg/mL, no other tests for homocysteine or MMA), many psychiatric and pain symptoms resolved almost immediately after treatment with methyl B12.) Have since had several episodes of severe muscle weakness and torso-based muscle spasms. So how does one tease out myelin damage from B12 ...