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Two, people with genuine B12 deficiency are, after withdrawal, at risk of developing worse symptoms, which may even persist after resuming treatment
doi:10.1016/j.celrep.2020.02.099 Luki I, Getselter D, Ziv O, et al
[2] When to Seek Medical Advice About B12 Levels Recognising when to seek medical evaluation for potential B12 deficiency is crucial, as early detection can prevent irreversible neurological complications
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