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it has to be supplied in sufficient amounts in the diet

NHS guidance is clear that it should be prescribed and given by, or under the supervision of, a suitably qualified professional

While these are population-level numbers, the principle applies to individuals as well: routine injection visits for non-deficient patients add up in copays, travel time, and appointment scheduling without delivering additional benefit

This documentation is invaluable for protocol adjustments

[1] Because intrinsic-factor-dependent uptake in the distal ileum can be absent in conditions such as autoimmune gastritis, pancreatic insufficiency, or bariatric surgery, the intramuscular or subcutaneous route bypasses gastrointestinal barriers and reliably restores serum concentrations