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Selected Literature Peer-reviewed publications cited in this overview [1] Sikiric P, et al
A much-cited 2000 study from the American Journal of Clinical Nutrition found nearly 40% of the population have B12 levels that fall at or below what experts consider the low end of normal
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Deficiency has wide-ranging effects
Proton pump inhibitor and histamine 2 receptor antagonist use and vitamin B12 deficiency
Studying gut health or using oral delivery
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