The Encyclopedia of Peptides

A to Z / Immune

VIP

Also known as Vasoactive Intestinal Peptide, Aviptadil.

Best known for The CIRS and mould-illness peptide
Evidence★★☆☆☆
Safety dataPoorly characterised
Route Nasal (unregulated supply) · intravenous (trials)
United StatesInvestigational (aviptadil)
AustraliaSchedule 4
as at 16 September 2026

What it is

Vasoactive Intestinal Peptide is a 28-amino-acid hormone found throughout the gut, lungs and nervous system. As a drug it is called aviptadil, and it has been through human trials without reaching approval. It is widely used intranasally within chronic inflammatory response syndrome (CIRS) and mould-illness protocols.

What the full entry covers

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Related entries

A certificate of analysis tells you what is in a vial. The evidence rating above tells you whether the compound has been shown to work in humans. Neither answers the other's question. How to read a certificate of analysis.

This page describes what is known and not known about VIP. It is not medical advice and not a recommendation to use it.