A naturally occurring 28-amino-acid neuropeptide with well-characterized physiology (vasodilation, secretion, immune modulation); as a therapeutic it is largely experimental, with limited approved use and short biological half-life.
Vasoactive intestinal peptide (VIP) is a natural signaling molecule found throughout the body, including the nervous system, gut, lungs, and immune tissue. As its name suggests, it was first noted for relaxing blood vessels and influencing intestinal secretion, but it is now understood as a broad regulator that affects circulation, glandular secretion, smooth-muscle tone, and immune activity. It belongs to the same family as the hormone secretin.
VIP works by binding to specific cell-surface receptors that raise intracellular signaling molecules, producing effects such as widening of blood vessels, relaxation of airway and gut muscle, and a generally anti-inflammatory, immune-calming influence. Because of this profile, it has been investigated in conditions ranging from pulmonary hypertension and airway disease to inflammatory and autoimmune disorders, and it has attracted interest in some wellness communities.
In practice, VIP is mostly a research and experimental agent rather than a mainstream approved drug, and a major obstacle is that the natural peptide is broken down very quickly in the body. Claims about specific health benefits, particularly outside controlled studies, often exceed the rigorous human evidence. Safety, optimal use, and real-world effectiveness for most proposed indications are not well established.
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