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If you suffer from vitamin B12 deficiency, you may notice that you are losing muscle strength or mass
MedlinePlus Medical Encyclopedia
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[3] Laboratory tests typically measure total B12 rather than the active form (holotranscobalamin), which can sometimes lead to misleading results
Failure to diagnose and treat in time, however, may result in permanent neurological damage, excessive fatigue, depression, memory loss, and other complications
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