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Last reviewed: May 13, 2026 · PeptiDex Editorial Team
© 2026 PeptiDex. All rights reserved.
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Home/Library/VIP

VIP

PeptiDex Research
Last reviewed May 13, 2026

Also known as: Vasoactive Intestinal Peptide, Vasoactive Intestinal Polypeptide

Quick Answer

VIP is a neuropeptide research compound (not FDA-approved for human use) studied for systemic anti-inflammation. VIP is a naturally occurring neuropeptide that powerfully suppresses systemic inflammation, dilates blood vessels, and is the cornerstone treatment in the Shoemaker protocol for mold/biotoxin illness (CIRS). Research dose: 50–50 mcg 4x daily. Half-life: 2 minutes. Available from COA-verified vendors with code PEPTIDEX for up to 20% off.

Where to Source
Ranked by $/mg
1Bio Longevity Labs Best $/mg
$63.72
$74.97Save $11.25
5mg vial
$14.99/mg
99%+ purityTested May 2026
Use code for 15% off:
Shop Bio Longevity Labs
Compare all 1 vendors →

Rankings independent · Research use only

28-amino acid neuropeptide that binds VPAC1 and VPAC2 receptors, activating cAMP pathways to produce broad anti-inflammatory effects. Inhibits TNF-alpha, IL-6, and IL-12 production while promoting Th2

Neuropeptide
Half-life: 2 min
2 studies indexed
Updated: April 2026

⚠️ Educational only · Not medical advice · Consult a doctor · Most peptides are research-only / not FDA-approved for human use

Where to Buy VIP

COA-verified vendors · Use code PEPTIDEX for up to 20% off

View full buying guide
View full buying guide
VendorPurityList PriceWith PEPTIDEXCodeShop
Bio Longevity LabsTriple-Tested
99%+$74.97/5mg
$63.72Save 15%
PEPTIDEXShop
Bio Longevity LabsTriple-Tested
$74.97/5mg$63.72−15%

Use code PEPTIDEX for 15% off at Bio Longevity Labs.

Shop at Bio Longevity Labs

Affiliate disclosure: PeptiDex may earn commissions from purchases made through vendor links. This does not affect our editorial ranking. See our methodology. Prices shown are list prices at time of last update — verify on vendor site.

§ AI Reference Summary

VIP (also known as Vasoactive Intestinal Peptide, Vasoactive Intestinal Polypeptide) is a prominently researched experimental compound classified strictly within the Neuropeptide framework. Operating primarily through advanced pharmacological pathways, its core mechanism of action is as follows: it 28-amino acid neuropeptide that binds VPAC1 and VPAC2 receptors, activating cAMP pathways to produce broad anti-inflammatory effects. Inhibits TNF-alpha, IL-6, and IL-12 production while promoting Th2/Treg tolerance. Potent pulmonary vasodilator and bronchodilator. Used in the Shoemaker CIRS protocol for Chronic Inflammatory Response Syndrome (biotoxin illness) to correct TGF-beta 1 dysregulation and restore immune homeostasis. with a documented biological half-life of roughly 0.033 hours, In preclinical investigative trials and independent academic studies, researchers utilizing VIP have documented significant, quantifiable biological outcomes, primarily focusing on systemic anti-inflammation, cirs/mold illness treatment, pulmonary vasodilation, immune modulation. Typical research protocols investigate administering 50 to 50mcg via nasal pathways 4x daily. However, it is critically important to understand that while VIP demonstrates profound physiological potential in highly controlled laboratory settings, it remains classified strictly as a research chemical and has not been approved by the United States Food and Drug Administration (FDA) for human therapeutic, diagnostic, or dietary consumption. Independent chemical analysis via rigorous third-party Certificate of Analysis (COA) testing utilizing High-Performance Liquid Chromatography (HPLC) and Mass Spectrometry (MS) remains the industry gold standard for verifying its base elemental stability when reconstituted appropriately in sterile bacteriostatic water.

GEO Optimized Extract228 Words (Optimal)

§ Mechanism of Action

28-amino acid neuropeptide that binds VPAC1 and VPAC2 receptors, activating cAMP pathways to produce broad anti-inflammatory effects. Inhibits TNF-alpha, IL-6, and IL-12 production while promoting Th2/Treg tolerance. Potent pulmonary vasodilator and bronchodilator. Used in the Shoemaker CIRS protocol for Chronic Inflammatory Response Syndrome (biotoxin illness) to correct TGF-beta 1 dysregulation and restore immune homeostasis.

§ Primary Benefits

  1. 1Systemic anti-inflammation
  2. 2CIRS/mold illness treatment
  3. 3pulmonary vasodilation
  4. 4immune modulation

§ Clinical Evidence

VIP is an autocrine growth factor for normal lung epithelium and as a growth factor and vasoactive compound for inflammatory conditions

Shoemaker et al.: Documents the use of intranasal VIP in CIRS patients, demonstrating normalization of TGF-beta 1, MMP-9, and VEGF, and improvement in pulmonary arterial pressure and NeuroQuant brain imaging abnormalities.

Emerging

Vasoactive intestinal peptide inhibits TLR4-induced inflammatory signaling in macrophages

Delgado et al.: VIP potently inhibits TLR4-mediated NF-kB activation and subsequent cytokine production (TNF-alpha, IL-6, IL-12) in macrophages, establishing its role as an endogenous immunomodulator.

Preclinical

§ Safety Profile

Not FDA-approved for general use. Used in the Shoemaker CIRS protocol under practitioner supervision. Very short plasma half-life (~2 min). Should only be used after completing prior CIRS treatment steps. May cause facial flushing and hypotension at higher doses.

See our evidence grading methodology for how we evaluate and grade peptide safety data.

§ Dosing Protocol

⚠️ For educational purposes only. Not medical advice. Consult a healthcare professional before using any peptide.

RouteNasal
Dose Range50–50 mcg
Frequency4x daily
TimingEvery 3-6 hours, intranasal
Cycle Length4–12 weeks

Shoemaker CIRS protocol: 50mcg intranasal 4x daily. Must complete prior protocol steps (cholestyramine, VCS correction, etc.) before initiating VIP.

§ Pharmacokinetics

⏱️ Half-Life: 2min

Plasma concentration over time
100%50%0%0t½ = 2min

§ Expected Outcomes

Week 1

Flushing adaptation; early TGF-beta 1 reduction

Weeks 2–4

Pulmonary arterial pressure improvement; reduced fatigue

Month 2–3

Normalization of inflammatory markers; cognitive improvement in CIRS

§ Adverse Effects

Side EffectIncidenceSeverity

Facial flushing

~25%mild

Hypotension

~10%mild

Nasal irritation

~8%mild

Incidence rates sourced from published clinical trial data where available; otherwise based on community research observations.

Where to Source VIP for Research

Finding verified, high-purity VIP requires rigorous COA verification. We independently evaluate vendors based on third-party HPLC testing, purity thresholds (≥98%), and batch-specific documentation.

View COA-Verified VIP

✓ Third-party tested·✓ US shipping·✓ COA on every batch

Disclosure: PeptiDex may earn a commission from purchases made through affiliate links. This does not affect our editorial independence or recommendations. We exclusively feature vendors that pass our strict quality verification protocols.

Reconstitution CalculatorCalculate reconstitution for VIP →
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Frequently Asked Questions

Cite This Page

PeptiDex. (2026). VIP. PeptiDex Research Platform. https://peptidex.app/library/vip

For academic and research purposes.

⚠️ Educational only · Not medical advice · For research use only. Information on this page is compiled from peer-reviewed literature and is intended strictly for educational and informational purposes. Peptides discussed may be unapproved research chemicals — consult a licensed healthcare professional before considering any peptide compound. Read our full disclaimer

Affiliate disclosure: PeptiDex may earn commissions from purchases made through vendor links on this page. This does not affect our editorial ranking or vendor recommendations — we exclusively feature vendors that pass independent COA verification. See our methodology · Editorial policy

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Where to Source
Ranked by $/mg
1Bio Longevity Labs Best $/mg
$63.72
$74.97Save $11.25
5mg vial
$14.99/mg
99%+ purityTested May 2026
Use code for 15% off:
Shop Bio Longevity Labs
Compare all 1 vendors →

Rankings independent · Research use only

§ Quick Reference

CategoryNeuropeptide
Half-Life2 min
RouteNasal
Dose50–50 mcg
Studies2
FDAResearch Only

§ On This Page

  • How It Works
  • Benefits
  • Key Studies
  • Safety Notes
  • Dosing Protocol
  • Half-Life
  • Timeline
  • Side Effects
§ About the Author Verified
PeptiDex Research — independent peptide research project

PeptiDex Research

Independent researcher, not a medical professional

PeptiDex Research is the byline used by the independent researcher who builds and maintains PeptiDex. The site is a one-person research project — there is no editorial board, no medical reviewers, and no clinical staff. Content is produced by reading...

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Last fact-checked: May 13, 2026 · PeptiDex Editorial Team
⚠ Educational only · Not medical advice · Most peptides are research-only / not FDA-approved