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Because its a peptide, it must be injected (or taken orally in specific cases) to preserve its structure and ensure it reaches target tissues
Areas of application: Vitamin B12 deficiency that cannot be remedied nutritionally
In gastric cancer after gastrectomy (which removes the gastric parietal cells and, thus, the source of intrinsic factor needed for normal vitamin B12 absorption), supplementation with vitamin B12 can prevent the development of vitamin deficiency (17)
It may also have benefits on the brain-gut axis
Independent replication by other groups remains limited for many reported effects
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