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Description
[6]Alfieri, Maria L

Slomianny, F

Early symptoms may include tiredness, reduced energy levels, weakness and difficulty concentrating

In cases of B12 deficiency, where the body lacks sufficient vitamin B12, Methylcobalamin is used

doi: 10.1056/NEJMoa1310460

Category 2: FDA-approved for specific conditions, prescribed off-label within longevity discussions
