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Published work on intranasal peptide delivery (for insulin analogs, calcitonin, and oxytocin) demonstrates that bioavailability for this size class without enhancers is typically in the low single-digit percent range, though these data are from different peptides with different charge profiles
Why is peptide therapy so expensive
Once-weekly GLP-1 injections such as semaglutide and dulaglutide can be administered at any time of day, but should be given on the same day each week for consistency
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It depends on the peptide and the person
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