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Common signs include fatigue, weakness, numbness, memory issues, and pale skin
all mechanistic and efficacy evidence is animal-derived or anecdotal, placing overall confidence at Low to Very Low for systemic human claims
[PMID: 12568923] PubMed record related to this compound for laboratory literature review
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According to the National Institutes of Health, B12 deficiency can cause damage to the nervous system before a blood test indicates anything
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