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Injections are also advantageous for individuals who have undergone gastric surgery, as the procedure can: Decrease the number of cells needed to secrete stomach acid and intrinsic factor in the gastrointestinal tract Help bypass absorption challenges Provide adequate levels of the essential vitamin Immediate Increase in Blood Levels B12 injections can raise blood levels of the vitamin within 48 to 72 hours

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They primarily work by mimicking a gut hormone that slows digestion, reduces appetite, and improves insulin secretion

It is critical for maintaining the integrity of peptide bonds during experimental handling