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In older people, a B12 deficiency usually happens as a result of insufficient levels of either stomach acid or intrinsic factor that limit absorption
Because of this and the fact that the body only needs a small amount of vitamin B12 each day, it can take up to a year or even longer for an inadequate vitamin B12 to manifest as an apparent deficiency
How often you need B12 injections depends on how severe your deficiency is and why you have it
Peptides are short chains of amino acids that act as signaling molecules in the body, influencing various biological processes
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Patients self-injecting vitamin B12 without telling their GP, finds study A large proportion of patients with a vitamin B12 deficiency self-inject medication sourced online, citing difficulty with accessing treatment from GPs
