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2013 (PMID 23055539), which carries a 2021 Expression of Concern

Generally, the threshold for needing a blood transfusion is a hemoglobin level below 7 to 8 grams per deciliter (g/dL) or lower

If you have signs of B12 deficiency despite a normal test result, it may be worth discussing a trial of B12 supplementation with your GP, as sometimes (for example, due to genetic variations) B12 struggles to enter cells, so deficiency symptoms can occur despite seemingly healthy blood levels

Most people living in industrialized nations tend to get enough vitamin B12, although not all

Persistent bacterial infections, antibiotic treatment failure, and microbial adaptive evolution

Vitamin B12 (cyanocobalamin or methylcobalamin ) is light-sensitive and can degrade when exposed to UV or fluorescent light