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Malabsorption of vitamin B12, resulting from structural or functional damage to the stomach, where intrinsic factor is secreted or to the ileum, where intrinsic factor facilitates vitamin B12 absorption

Alcohol can interfere with the absorption, storage, metabolism, and activation of these vitamins, causing an imbalance that can potentially affect numerous body systems

Mechanism of action: a head-to-head comparison Understanding how these two compounds work at the cellular level reveals why they produce such different outcomes

Replacement therapy for vitamin B 12 deficiency: comparison between the submingual and oral route