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doi: 10.1007/s11695-014-1441-5

Mass Spectrometry (MS) Verification Mass spectrometry charts the precise atomic weight of the amino acid chains

But you can also have a vitamin B12 deficiency without having anemia

Molecules 25 (23), 5717

Some people also experience dizziness, headache, dry mouth, and blurred vision

This underdiagnosis can lead, besides death in 20% when it is not appropriately treated, to Korsakoffs syndrome, a severe dysfunction often following untreated Wernickes encephalopathy, that does not remit even with thiamine treatment and is associated with chronic alcohol abuse and chronic thiamine deficiency (, , , )