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If you are B12 deficient, you may feel fatigued, weak, and depressed
Its usually set between 500-2000 mcg daily
Recovery considerations Recovery takes longer during caloric restriction
Where results are borderline, measurement of methylmalonic acid (MMA) or holotranscobalamin (active B12) may help clarify the picture, as recommended in NICE CKS guidance on B12 and folate deficiency anaemia
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