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Oral therapy is not always effective, as some persons lack intrinsic factor, an endogenous substance produced by the stomach and necessary for oral B12 absorption
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Sterile water for injection is widely available at pharmacies, often without a prescription, and through medical supply distributors
Quick refresher: what B12 actually does Vitamin B12 (cobalamin) is a water-soluble vitamin involved in red blood cell formation, nervous system maintenance, and the methylation reactions that support energy metabolism
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