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Glossary

Bioavailability

The fraction of a substance that reaches the circulation in active form. Peptides generally have low oral bioavailability because digestive enzymes break them down.

Further reading

Intranasal peptide delivery: what the research literature actually shows
Why peptides are studied as nasal formulations, the biological barriers involved, what is known about nose-to-brain transport, and why claims about nasal sprays deserve caution.

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For laboratory research only. Nothing on peptide.wiki is medical advice. The compounds described are not for human or veterinary use, and research-grade material is not a medicine.