Immune

VIP

Vasoactive intestinal peptide

Studied forLung disease1

No FDA-approved product identified for this exact research entry in the targeted review.

What does it do?

VIP/aviptadil is a vasoactive neuropeptide investigated for inflammatory and pulmonary disease; CIRS nasal protocols are not FDA-approved therapy.

Approved & studied uses

Pulmonary disease research

1

Human trials assessed pulmonary outcomes; the larger intravenous trial was negative.

Community uses Reported, unvalidated

Inflammation

17

CIRS, autoimmune and respiratory claims.

Neurological

17

Cognition, neuroprotection, sleep/circadian and mood research.

Vascular / lung

17

Pulmonary hypertension, perfusion, cardiac and COVID-ARDS research; results vary.

Reasons people report using it; these do not establish benefit.17

Evidence limits

View research →

An effect in a small inhaled study would not establish effectiveness of intravenous or community intranasal products.1

3 distinct primary sources or abstracts checked. Evidence may concern a parent compound, individual blend ingredient, animal, or cell model; it does not necessarily establish a benefit for this exact product.

Evidence definitions →

Key safety information

All risks →

Evidence limitation

The day-5 serious safety composite occurred in 63% versus 56%; the difference was not statistically significant.1

No FDA-approved product identified for this exact research entry in the targeted review.

Molecular information

Amino-acid sequence

  1. His
  2. Ser
  3. Asp
  4. Ala
  5. Val
  6. Phe
  7. Thr
  8. Asp
  9. Asn
  10. Tyr
  11. Thr
  12. Arg
  13. Leu
  14. Arg
  15. Lys
  16. Gln
  17. Met
  18. Ala
  19. Val
  20. Lys
  21. Lys
  22. Tyr
  23. Leu
  24. Asn
  25. Ser
  26. Ile
  27. Leu
  28. Asn

28 residues · N → C17

Reference identity · not independently confirmed17

Length28 amino acids
Molecular weight · Da3326.8 Da
Formula, sequence notation & identity
Molecular formulaNot independently verified317
His-Ser-Asp-Ala-Val-Phe-Thr-Asp-Asn-Tyr-Thr-Arg-Leu-Arg-Lys-Gln-Met-Ala-Val-Lys-Lys-Tyr-Leu-Asn-Ser-Ile-Leu-Asn-NH2

Identity reported by Pep-Pedia; exact-product sequence and modifications have not been independently confirmed.

Vasoactive intestinal peptide

The exact formulation, clinical benefits and long-term safety require further verification.

Pep-Pedia identity details

28 amino acids · 3326.8 Da

His-Ser-Asp-Ala-Val-Phe-Thr-Asp-Asn-Tyr-Thr-Arg-Leu-Arg-Lys-Gln-Met-Ala-Val-Lys-Lys-Tyr-Leu-Asn-Ser-Ile-Leu-Asn-NH2

Reference description; checked chemical identity above takes precedence when available.17

Pharmacokinetics

How long does it stay in the body?

Unverified reference estimateNot independently confirmed
Reference half-life30 min16
Route / formulationSource page: Nasal. Exact PK route not verified.

This value is reported by a secondary reference. The stated attribution has not been independently verified as a route- and formulation-matched human PK measurement.

Illustrative half-life model for VIP: Pep-Pedia estimateNormalized terminal-phase decline, not measured blood concentration or effect duration. Five half-lives leaves 3.125%. 0%50%100%030 min1 h1.5 h2 h2.5 h1 half-life
50%of reference level

Illustrative scenario using an unverified reference estimate.

About 3% remaining after 2.5 h

Five half-lives in this estimated model. This is not a prediction of when effects stop.

Evidence and model details

Population: Not established by the reference estimate

Source’s stated attribution: Youssef et al. 2022

Source’s reported peak time: 15 min. This has not been independently confirmed and is not used in the elimination curve.

100 × 2−time / half-life. Time zero is a reference level, not the moment of administration. Absorption, repeated dosing, metabolites and clinical effects are not modeled. Five half-lives leaves 3.125%, not zero. This curve cannot determine a dosing interval.

What to expect

Study outcomes

Large intravenous trial was negative

The larger intravenous trial did not demonstrate clinical benefit.1

Route matters

Preliminary inhaled findings cannot be transferred to injected or intranasal formulations.2

Reported timelines

Reference & community

Source expectations

Nasal sleep/energy 1–2 weeks, inflammation 2–8+, months for CIRS; injection claims 2–12 weeks. No validated universal timeline.17

These are reported timelines, not a prediction of your response.

Community poll 10 topics · Pep-Pedia snapshot

Voluntary, unverified reports. These percentages do not measure effectiveness or safety.

Primary goal

General wellness38%
Recovery/Healing33%
Other (please specify)8%
Other: Auto immune and inflammatory issues 4%
Other: Immune support4%

The source hides 3 additional categories. Their labels and percentages are unavailable.

Number of responses to this question: not disclosed.

Source & limitations

The source displays “247 responses” for this profile. This is not a confirmed participant count or a denominator for individual questions.

  • Voluntary self-reports from Pep-Pedia visitors; identity, treatment, outcomes and timing are unverified. These data are not efficacy or safety estimates.
  • The source displays a profile-wide response label, not a confirmed unique participant count. It stays unchanged across questions. Question-specific denominators and absolute option counts are not exposed.
  • Only the top five categories are displayed for some questions. Extra categories are retained as an undisplayed-category count; their labels and percentages are unavailable.
  • Displayed percentages are rounded. They may not total 100%, especially where categories are hidden.
  • This is a dated snapshot, not a live survey or current recommendation.
Protocols

Doses & schedules

Compare purpose, amount, route, frequency, and duration.

Source corrections

Shoemaker screening/lab sequences are protocol claims, not FDA instructions.

11 rows
Route

Scroll to compare all columns →

One row for each documented route and dose or dose range
RouteDoseFrequencyGoal / evidenceDurationReferences
IVIntravenous600 pmol/kg12-hour infusionCOVID-19 hypoxaemic respiratory failureHuman studyDay 11
IVIntravenous1200 pmol/kg12-hour infusionCOVID-19 hypoxaemic respiratory failureHuman studyDay 21
IVIntravenous1800 pmol/kg12-hour infusionCOVID-19 hypoxaemic respiratory failureHuman studyDay 31
IntranasalNasal50 mcg per spray, 4-8 sprays/day4x dailyCIRS protocol (Shoemaker)Reference report4-12 weeks or ongoing based on condition17
IntranasalNasal50-100 mcg2-4x dailyGeneral immune supportReference report4-12 weeks or ongoing based on condition17
IntranasalNasal50 mcgStarting dose2x dailyStarting/sensitive patientsReference report4-12 weeks or ongoing based on condition17
IntranasalNasal100-200 mcg2-4x dailyAdvanced/maintenanceReference report4-12 weeks or ongoing based on condition17
SubQ10-30 mcgStarting dose1x dailyStarting / Assess toleranceReference report3 months on17
SubQ200 mcg (0.2 mg)5x weekly (Mon-Fri)Standard protocolReference report3 months on17
SubQ1 mg/weekSplit across 5 dosesWeekly totalReference report3 months on17
SubQSubQ (repeat annually x3 cycles)200 mcg3 months on, 1 month offCycle protocolReference report3 months on17

Study and label doses retain their study context. Reference reports are unvalidated practices, not personal treatment instructions. Ranges remain ranges; escalation stages are labeled.

Cycles & timing

Reference reports17

Reported use periods and breaks. These do not establish a safe cycle or prove that breaks prevent tolerance.

Nasal

Use period
4-12 weeks or ongoing based on condition
Break
May use continuously under medical supervision
Reported timing

Morning and evening, or spread throughout day

Injectable

Use period
3 months on
Break
1 month off, repeat x3 cycles annually
Reported timing

Consistent time daily, earlier in day preferred for circadian alignment

Side effects & safety

Evidence limitation

The day-5 serious safety composite occurred in 63% versus 56%; the difference was not statistically significant.

1

Evidence limitation

Results in critically ill patients do not establish safety of self-administered VIP.

1

Additional reported cautions

Reference reports17

Common

Flushing, headache, nausea, diarrhea, nasal irritation and hypotension.

Urgent

Abdominal pain/lipase elevation, persistent diarrhea/vomiting, fainting, chest pain/dyspnea, severe headache or allergy.

Context

BP drugs and pregnancy/breastfeeding require caution; trial monitoring is not home-use reassurance.

Not a complete safety screen. Discuss health decisions with a qualified clinician.

Combinations & interactions

9 entries

Check cautions and reported pairings. A compatibility claim does not establish that a combination is safe.

BPC-157

Unverified pairing

Untested pairing.17

Reference report · Pep-Pedia label: Compatible

Thymosin Alpha-1

Unverified pairing

Untested pairing.17

Reference report · Pep-Pedia label: Synergistic

LL-37

Unverified pairing

Untested pairing.17

Reference report · Pep-Pedia label: Compatible

KPV

Unverified pairing

Untested pairing.17

Reference report · Pep-Pedia label: Synergistic

Selank

Unverified pairing

Untested pairing.17

Reference report · Pep-Pedia label: Compatible

DSIP

Unverified pairing

Untested pairing.17

Reference report · Pep-Pedia label: Compatible

Cerebrolysin

Related compound

Composition/mechanistic claim unverified.17

Reference report · Pep-Pedia label: Similar

GHK-Cu

Unverified pairing

Untested pairing.17

Reference report · Pep-Pedia label: Compatible

Other pulmonary or vasoactive treatments

Not established

Use alongside standard care in hospital trials does not validate arbitrary drug combinations or mixing in one vial.12

Research context

Reconstitution

No validated preparation identified

Clinical trials used controlled investigational formulations; no universal research-vial preparation was verified.12

Reference preparation details

Reported handling information, not a validated formulation or instruction to prepare an injectable product.

Nasal

The source describes a pharmacy-compounded nasal spray.

Form
Source describes a prepared product
Reported parameters
Reported storage: 2–8°C; actual metered pump output determines amount per spray.

Injectable

The source gives a 5 mg vial example.

Solvents mentioned
Bacteriostatic water
Reported parameters
5 mg in 5 mL gives 1 mg/mL. · At that concentration, 200 mcg occupies 0.2 mL (20 U-100 syringe units). · Reported storage: 2–8°C.

The source describes gentle mixing and avoiding vigorous shaking.

17
Appearance & documentation

Appearance and a purity certificate cannot establish sterility, identity, or suitability for injection.

Reported appearanceClear SolutionReported appearanceProper Spray FunctionReported appearanceLicensed Compounding PharmacyReported variationTemperature During ShippingReported concernCloudiness or ParticlesReported concernDiscoloration
17

Available forms

No verified packaging examples included.

Packaging examples, not a market survey. Approved and research products are not interchangeable.

Storage after mixing

Reconstituted research vials

Refrigerated lifetime not established

The checked sources do not establish how long this research preparation remains stable and sterile after mixing.17

Full storage notes from Pep-Pedia17
Nasal

Fridge 2-8°C

Injectable

Fridge 2-8°C, reconstituted stable ~25 doses per 5mg vial

Storage depends on the formulation, diluent, container, and handling. Follow the specific product label or pharmacist’s instructions.

Research findings

Human trials

Source context

Shoemaker screening/lab sequences are protocol claims, not FDA instructions.

Compound identity & other names

VIP, including synthetic aviptadil, is investigated in pulmonary and inflammatory conditions. A larger IV COVID-19 trial was negative; a smaller inhaled trial reported faster discharge. Neither establishes intranasal community protocols.

No FDA-approved product identified for this exact research entry in the targeted review.

How it may work

VPAC1/2 signaling increases cAMP and affects vascular tone and immune responses.17

Large intravenous trial was negative

TESICO found no improvement in day-90 outcomes with aviptadil: odds ratio 1.11 (95% CI 0.80–1.55). Mortality was 38% versus 36% with placebo. The trial stopped for futility.

1

Smaller inhaled trial has a different result

A 2025 study in 80 patients reported hospitalization averaging 7.8 versus 10 days with inhaled treatment. The small sample and different route limit comparison with the negative intravenous trial.

2

Source checks & newer research

TESICO randomized IV aviptadil trial

Aviptadil did not significantly improve recovery or mortality through day 90 in COVID hypoxemic respiratory failure; hypotension, flushing and diarrhea were more common. Findings concern monitored IV therapy, not nasal CIRS use.

Randomized placebo-controlled trial18
Research areas and evidence gaps

Pulmonary disease research. Human trials assessed pulmonary outcomes; the larger intravenous trial was negative.1

  • An effect in a small inhaled study would not establish effectiveness of intravenous or community intranasal products.
  • A product-specific research-vial quantity was not independently verified in this review.
Community reports Unvalidated

Pep-Pedia discusses pulmonary and inflammatory research.3

Editorial summary, not a measured community survey, clinical protocol or recommendation.

Search coverage and review status

Added the larger negative intravenous TESICO trial and the smaller 2025 inhaled study. Their populations, routes and findings differ.

Checked
2026-10-12
Search
"aviptadil" 2025 2026 trial; TESICO 2023
Catalog
Pep-Pedia ↗ · 12 listed references retained
  • Targeted search and selected primary-source checks, not an exhaustive systematic review.
  • Preserved bibliography entries marked unreviewed have not had their findings independently verified.

AI-prepared summaries. Independent medical editorial review is pending.

References

Original sources and review status. Open a reference to read its summary.

18 sources

1Intravenous aviptadil and remdesivir for COVID-19-associated hypoxaemic respiratory failure in the USA (TESICO): a randomised, placebo-controlled trialTrial · 2023 · pubmed.ncbi.nlm.nih.govAbstract checked
AI-PREPARED SUMMARY

Among 461 treated participants, aviptadil did not improve the day-90 clinical outcome or survival versus placebo. The trial stopped for futility.

Large intravenous trial was negative

TESICO found no improvement in day-90 outcomes with aviptadil: odds ratio 1.11 (95% CI 0.80–1.55). Mortality was 38% versus 36% with placebo. The trial stopped for futility.

Additional research · Checked 2026-10-12

Original source
2Inhaled Aviptadil Is a New Hope for Recovery of Lung Damage due to COVID-19Trial · 2025 · pubmed.ncbi.nlm.nih.govAbstract checked
AI-PREPARED SUMMARY

An 80-patient randomized study reported shorter hospitalization with inhaled aviptadil added to usual care. This small study used a different route from TESICO and does not establish a mortality benefit.

Smaller inhaled trial has a different result

A 2025 study in 80 patients reported hospitalization averaging 7.8 versus 10 days with inhaled treatment. The small sample and different route limit comparison with the negative intravenous trial.

Additional research · Checked 2026-10-12

Original source
3Pep-Pedia: VIPCommunity · Accessed 2026 · pep-pedia.orgCommunity source checked
AI-PREPARED SUMMARY

Secondary editorial profile and reported practices; not clinical validation.

Original source
4IV Aviptadil in Critical COVID-19 Respiratory Failure - Phase 2b/3 RCT (2022)Reference · Accessed 2026 · pmc.ncbi.nlm.nih.govPep-Pedia report · Primary source not checked
AI-PREPARED SUMMARY

Pep-Pedia reports: The source reports higher 60-day survival odds in one COVID trial; endpoint hierarchy and later trials must be considered before claiming efficacy.

Reported population / model
Humans

Reported study details
196 patients · IV infusion · 60 days · 2-fold increased survival odds

Reported by Pep-Pedia; the linked publication, design, doses and result have not been independently verified here.

Read the Pep-Pedia report ↗

Pep-Pedia reference card; original summary of its reported findings · Checked 2026-10-12

Listed study
5VIP Corrects Chronic Inflammatory Response Syndrome (2013)Reference · Accessed 2026 · scirp.orgPep-Pedia report · Primary source not checked
AI-PREPARED SUMMARY

Pep-Pedia reports: The source attributes broad CIRS improvements to nasal VIP; controlled design and attribution of later imaging/molecular claims need verification.

Reported population / model
Humans

Reported study details
CIRS patients · Nasal spray 50mcg · Multiple months · Correction of inflammatory markers

Reported by Pep-Pedia; the linked publication, design, doses and result have not been independently verified here.

Read the Pep-Pedia report ↗

Pep-Pedia reference card; original summary of its reported findings · Checked 2026-10-12

Listed study
6IUPHAR Review: VIP and PACAP Receptor Pharmacology (2012)Reference · Accessed 2026 · pubmed.ncbi.nlm.nih.govPep-Pedia report · Primary source not checked
AI-PREPARED SUMMARY

Pep-Pedia reports: The receptor review details VIP/PACAP signaling and physiology; target mechanisms do not establish clinical efficacy across the discussed diseases.

Reported population / model
Review

Reported study details
Comprehensive analysis of VPAC1/VPAC2/PAC1 receptors

Reported by Pep-Pedia; the linked publication, design, doses and result have not been independently verified here.

Read the Pep-Pedia report ↗

Pep-Pedia reference card; original summary of its reported findings · Checked 2026-10-12

Listed study
7VIP Prevents Experimental Arthritis (2001)Reference · Accessed 2026 · pubmed.ncbi.nlm.nih.govPep-Pedia report · Primary source not checked
AI-PREPARED SUMMARY

Pep-Pedia reports: A mouse arthritis model reportedly showed less joint inflammation and structural damage after VIP exposure.

Reported population / model
Mice

Reported study details
CIA model · IP injection · 2 weeks · Complete prevention of joint destruction

Reported by Pep-Pedia; the linked publication, design, doses and result have not been independently verified here.

Read the Pep-Pedia report ↗

Pep-Pedia reference card; original summary of its reported findings · Checked 2026-10-12

Listed study
8Intranasal VIP Pharmacodynamics and Toxicity (2013)Reference · Accessed 2026 · pubmed.ncbi.nlm.nih.govPep-Pedia report · Primary source not checked
AI-PREPARED SUMMARY

Pep-Pedia reports: The source reports brain delivery and better animal memory with limited nasal irritation; it does not establish human intranasal safety.

Reported population / model
Animal model

Reported study details
40-200mcg/mL · 1 week · Safe brain delivery confirmed

Reported by Pep-Pedia; the linked publication, design, doses and result have not been independently verified here.

Read the Pep-Pedia report ↗

Pep-Pedia reference card; original summary of its reported findings · Checked 2026-10-12

Listed study
9Inhaled VIP in Pulmonary Hypertension (2008)Reference · Accessed 2026 · pubmed.ncbi.nlm.nih.govPep-Pedia report · Primary source not checked
AI-PREPARED SUMMARY

Pep-Pedia reports: Twenty patients had acute pulmonary vascular changes; six exceeded a 20% resistance reduction after inhalation, without establishing long-term outcomes.

Reported population / model
Humans

Reported study details
20 PH patients · 100mcg inhaled · Acute study · Selective pulmonary vasodilation

Reported by Pep-Pedia; the linked publication, design, doses and result have not been independently verified here.

Read the Pep-Pedia report ↗

Pep-Pedia reference card; original summary of its reported findings · Checked 2026-10-12

Listed study
10Pharmacology and functions of VIP and PACAP receptors: IUPHAR review 1Reference · Accessed 2026 · pubmed.ncbi.nlm.nih.govPep-Pedia report · Primary source not checked
AI-PREPARED SUMMARY

Pep-Pedia reports: The receptor review details VIP/PACAP signaling and physiology; target mechanisms do not establish clinical efficacy across the discussed diseases.

Reported population / model
Review

Reported study details
Comprehensive analysis of VPAC1/VPAC2/PAC1 receptors

Reported by Pep-Pedia; the linked publication, design, doses and result have not been independently verified here.

Read the Pep-Pedia report ↗

Pep-Pedia reference card; original summary of its reported findings · Checked 2026-10-12

Listed study
11IV Aviptadil in critical COVID-19 respiratory failure: 60-day RCTReference · Accessed 2026 · pmc.ncbi.nlm.nih.govPep-Pedia report · Primary source not checked
AI-PREPARED SUMMARY

Pep-Pedia reports: The source reports higher 60-day survival odds in one COVID trial; endpoint hierarchy and later trials must be considered before claiming efficacy.

Reported population / model
Humans

Reported study details
196 patients · IV infusion · 60 days · 2-fold increased survival odds

Reported by Pep-Pedia; the linked publication, design, doses and result have not been independently verified here.

Read the Pep-Pedia report ↗

Pep-Pedia reference card; original summary of its reported findings · Checked 2026-10-12

Listed study
12VIP corrects CIRS acquired following water-damaged building exposureReference · Accessed 2026 · scirp.orgPep-Pedia report · Primary source not checked
AI-PREPARED SUMMARY

Pep-Pedia reports: The source attributes broad CIRS improvements to nasal VIP; controlled design and attribution of later imaging/molecular claims need verification.

Reported population / model
Humans

Reported study details
CIRS patients · Nasal spray 50mcg · Multiple months · Correction of inflammatory markers

Reported by Pep-Pedia; the linked publication, design, doses and result have not been independently verified here.

Read the Pep-Pedia report ↗

Pep-Pedia reference card; original summary of its reported findings · Checked 2026-10-12

Listed study
13VIP prevents experimental arthritis by reducing autoimmune and inflammatory componentsReference · Accessed 2026 · pubmed.ncbi.nlm.nih.govPep-Pedia report · Primary source not checked
AI-PREPARED SUMMARY

Pep-Pedia reports: A mouse arthritis model reportedly showed less joint inflammation and structural damage after VIP exposure.

Reported population / model
Mice

Reported study details
CIA model · IP injection · 2 weeks · Complete prevention of joint destruction

Reported by Pep-Pedia; the linked publication, design, doses and result have not been independently verified here.

Read the Pep-Pedia report ↗

Pep-Pedia reference card; original summary of its reported findings · Checked 2026-10-12

Listed study
14VIP as a new drug for primary pulmonary hypertensionReference · Accessed 2026 · pmc.ncbi.nlm.nih.govLinked reference · Not independently reviewed
REFERENCE NOTE

Reference retained from Pep-Pedia’s bibliography; findings and bibliographic accuracy have not been independently verified.

Pep-Pedia bibliography · Checked 2026-10-12

Listed source
15From VIP through ADNP to NAP: neuroprotection and cell divisionReference · Accessed 2026 · pubmed.ncbi.nlm.nih.govLinked reference · Not independently reviewed
REFERENCE NOTE

Reference retained from Pep-Pedia’s bibliography; findings and bibliographic accuracy have not been independently verified.

Pep-Pedia bibliography · Checked 2026-10-12

Listed source
16Pep-Pedia: VIP — reported pharmacokineticsReference estimate; not independently verified human PKCommunity · 2026 · pep-pedia.orgCommunity source checked
AI-PREPARED SUMMARY

Lists a half-life of 30 min and a peak time of 15 min. Stated attribution: Youssef et al. 2022. This value is reported by a secondary reference. The stated attribution has not been independently verified as a route- and formulation-matched human PK measurement. Five half-lives is not complete clearance, and the source’s “cleared” value is not used as a measured endpoint.

Secondary reference page checked; the underlying quantitative claim is not independently confirmed. · Checked 2026-10-12

Original source
17Pep-Pedia: VIP — route-specific referenceReference page checked; underlying claims require separate verification.Community · Checked 2026 · pep-pedia.orgCommunity source checked
AI-PREPARED SUMMARY

Source page checked across available routes. Protocols, cycles, storage, mechanisms and pairing claims are secondary reports; checking the page does not independently validate those claims. Original concise summaries are used here.

Content coverage audit · Checked 2026-10-12

Original source
18TESICO randomized IV aviptadil trialTrial · 2023 · pmc.ncbi.nlm.nih.govPrimary source checked
AI-PREPARED SUMMARY

Aviptadil did not significantly improve recovery or mortality through day 90 in COVID hypoxemic respiratory failure; hypotension, flushing and diarrhea were more common. Findings concern monitored IV therapy, not nasal CIRS use.

TESICO randomized IV aviptadil trial

Aviptadil did not significantly improve recovery or mortality through day 90 in COVID hypoxemic respiratory failure; hypotension, flushing and diarrhea were more common. Findings concern monitored IV therapy, not nasal CIRS use.

Additional primary-source check · Checked 2026-10-12

Original source
Source details