Nose-to-Brain (N2B) Delivery
Nose-to-Brain Drug Delivery Pathway Explained
A 2025 PET imaging study confirmed insulin reaches the human brain via nasal delivery in 30 minutes.
Kai Mbeki
Senior Writer · · 13 min read
A 2025 PET imaging study confirmed insulin reaches the human brain via nasal delivery in 30 minutes.
Gastric acid and intestinal enzymes destroy most peptides before they reach absorptive cells.
The area postrema bypasses the blood-brain barrier to trigger nausea in roughly half of GLP-1 users.
Most GLP-1 patients quit within a year, often before the drug delivers visible results.