🔑 Key Takeaways
- VIP is a potent anti-inflammatory neuropeptide that suppresses pro-inflammatory cytokines (TNF-α, IL-6, IL-12)
- Used in CIRS (mold illness) protocols to restore regulatory neuropeptide balance
- Bronchodilator — relaxes smooth muscle in the airways and pulmonary vasculature
- Supports gut motility and intestinal immune regulation
- Intranasal is the primary research delivery route for systemic effects
VIP is well-known in a specific corner of the medical world: CIRS (Chronic Inflammatory Response Syndrome) — a condition associated with biotoxin exposure (mold, Lyme disease) that leaves the immune system chronically dysregulated. Dr. Ritchie Shoemaker's CIRS protocol includes VIP as a late-stage treatment to normalize inflammatory markers and restore regulatory neuropeptide levels that biotoxin illness depletes.
Outside of CIRS, VIP has a broader pharmacological profile worth understanding. It's a genuine anti-inflammatory peptide with activity across multiple organ systems — lungs, gut, immune system, and vasculature.
What Is VIP?
Vasoactive Intestinal Peptide is a 28-amino acid neuropeptide first isolated from porcine intestine in 1970 (hence the "intestinal" in the name). It's found throughout the body — in the enteric nervous system of the gut, peripheral autonomic nerves, the lungs, the brain, and immune cells. VIP receptors (VPAC1, VPAC2, and PAC1) are expressed across a wide range of tissues, which explains its diverse effects.
It works primarily through cAMP-mediated signaling, causing smooth muscle relaxation (vasodilation, bronchodilation) and suppressing inflammatory immune responses.
VIP Benefits & Research Applications
Anti-Inflammatory
VIP potently suppresses TNF-α, IL-6, IL-12, and IFN-γ — the core pro-inflammatory cytokines driving many chronic inflammatory conditions. It simultaneously upregulates anti-inflammatory IL-10 and TGF-β.
Pulmonary Vasodilation
VIP relaxes pulmonary vascular smooth muscle — it's been studied for pulmonary arterial hypertension (PAH). Inhaled VIP reduced mean pulmonary artery pressure in PAH patients in early clinical studies.
Immune Modulation (CIRS)
In CIRS protocols, VIP addresses the regulatory neuropeptide deficiency that biotoxin illness creates. It normalizes VEGF, MMP9, C4a, and TGF-β1 — inflammatory markers that define CIRS severity.
Gut Motility & Intestinal Health
VIP regulates intestinal smooth muscle, blood flow, and immune function in the gut. It's involved in secretion, motility, and the maintenance of the gut immune barrier. Relevant for IBS and inflammatory bowel conditions.
Neuroprotection
VIP has neurotrophic and neuroprotective effects. It supports neuronal survival and is being studied in neuroinflammatory conditions including multiple sclerosis and Parkinson's disease models.
Autoimmune Regulation
By shifting immune responses from Th1/Th17 (pro-inflammatory) toward Treg (regulatory) phenotypes, VIP reduces autoimmune inflammation. Studied in rheumatoid arthritis, lupus, and Crohn's disease models.
VIP in CIRS Protocols
In Shoemaker's CIRS protocol, VIP is typically used in the final stage after:
- Removal from biotoxin exposure
- Cholestyramine or welchol (binders) to clear toxins
- Correction of MARCoNS, hormone imbalances, and prior inflamm markers
VIP at this stage is used to normalize persistent dysregulation — particularly elevated TGF-β1, low VEGF, and ongoing symptoms that don't resolve with earlier interventions. It's considered a regulatory peptide replacement, addressing what biotoxin illness depletes from the body's natural regulatory system.
VIP Dosage Protocol
VIP Side Effects
VIP is generally well tolerated at intranasal doses. Reported effects:
- Nasal irritation or congestion (from intranasal application)
- Mild facial flushing (vasodilatory effect)
- Hypotension at higher doses — VIP is a vasodilator; those with low blood pressure should start low
- Some CIRS patients report temporary symptom flaring when starting VIP
Where to Get VIP Peptide
Ascension Peptides carries VIP 10mg — lyophilized, third-party tested. For intranasal use, you'll need a nasal spray atomizer and bacteriostatic water for reconstitution. Store lyophilized VIP at -20°C and reconstituted solution at 4°C.
VIP is one of several peptides with a genuine role in gut physiology but no human gastrointestinal trial behind it. Our guide to gut health peptides compared by evidence tier sets out which compounds in this category are approved drugs and which, like VIP, remain preclinical.
