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This can happen due to low levels of intrinsic factors in the digestive system, digestive conditions, or following a plant-based diet
External resources for researchers Related research products Disclaimer Used solely for in vitro experiments and cannot be: Used in clinical trials involving humans Administered to humans as part of an experiment or investigation Supplied to another party for human investigational use
Brain Res 885(1):4552
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Researchers note that intranasal delivery may especially increase the bioavailability of peptide therapeutics and present an appealing alternative to injection [14, 15, 16]
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