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Description
This can lead to a deficiency, necessitating alternative methods of supplementation

It helps with energy and nerve health

[PMC free article: PMC3174853] [PubMed: 21593511] 41

Methylcobalamin is the active and naturally occurring form of Vitamin B12, which is critical for the healthy function of the brain, nerves, and for the formation of red blood cells

If your serum B12 level was 0 then I'm guessing you feel really ill
