Sun, Y., Koyama, Y
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
Others are early in research but backed by data that demands attention
Sanchez, L., Mitjans, M., Infante, M
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Undeclared active substances Products that are frequently marketed as natural actually contain pharmacologically active substances without any declaration or dosage information