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Is the promised benefit strong enough to justify the risk of using a product that has not cleared the usual standards for drug quality and evidence

It bypasses first-pass hepatic metabolism which oral delivery does not allowing a greater proportion of the absorbed peptide to remain intact as it enters circulation.7 The olfactory pathway also provides a potential direct nose-to-brain route, bypassing the blood-brain barrier a property that has generated interest for neuropeptides and potential neurological applications

First, What Is a Peptide

Researchers should consult primary literature (Sikiric et al., 2010-2020) for the concentrations reported in each study