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For individuals with pernicious anaemia or a condition that prevents B12 absorption, injections are medically necessary because oral supplementation will not be absorbed effectively
Age-related factors Older people are at more risk because with age the production of stomach acid and intrinsic factor (a protein necessary for B12 absorption) can decrease
Sikiric P, Seiwerth S, Brcic L, et al
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These trials should follow standardized dosing, objective endpoints, and rigorous safety protocols
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