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A person can have high total B12 but poor intracellular use, especially when MMA is high, homocysteine is high, or there are neurologic symptoms such as numbness or gait trouble

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[DOI] [PubMed] [Google Scholar] 256.Bartolone R.S., Rao T.L
Lumbar plexopathies: These conditions can cause sensory and motor deficits without any pain, depending on the cause
