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For naturally occurring B12 in food, the presence of gastric acid, pepsin, and intrinsic factor is essential for liberation and absorption
For most of us, though, it would probably be cheaper and more convenient to just take a supplement
Lyophilised (freeze-dried) peptide compounds used in clinical trials must be reconstituted with a sterile diluent before administration
But unregulated peptides may not have been studied in humans or shown to be effective or safe
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