When B12 is low, cognitive function can suffer noticeably, making it hard to focus, recall words, or think clearly
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Fatigue, headache, or mild dizziness may also occur, particularly during the early stages of therapy
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Serum B12 reference ranges vary between laboratories, but generally, levels below 148 pmol/L are considered deficient, whilst levels between 148258 pmol/L are regarded as borderline and may warrant further investigation or a trial of treatment, particularly if symptoms are present
[DOI] [PubMed] [Google Scholar] 91.Ledoux S., Msika S., Moussa F., Larger E., Boudou P., Salomon L., Roy C., Clerici C