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Your gut has a limited transport system, and once that system is saturated, the rest of the dose relies on passive diffusion, which is very inefficient
Two forms of injectable B12 are commonly prescribed
Hence, you can receive it once or twice weekly
NICE notes that pernicious anaemia is the most common cause of Vitamin B12 deficiency in those aged 40-70, with an average onset age of 60 in white people and 50 in black people, although it can affect black women at a younger age
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