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Deficiency after gastric banding is therefore primarily related to: Reduced dietary intake and food tolerance , limiting consumption of B12-rich foods Use of acid-suppressing medicines (PPIs or H2RAs) , which can impair the release of B12 from food proteins and reduce absorption of food-bound B12 Crystalline B12 the form found in supplements and fortified foods does not require acid or pepsin for release
Additionally, the medications' effects on nausea and the gastrointestinal system may create aversions to certain foods or alter the subjective experience of eating
Many suppliers provide batch-specific analytical documentation such as HPLC and mass spectrometry results
Pharmacol Biochem Behav 30 : 299302
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