The name Vasoactive Intestinal Peptide (VIP) sounds surprisingly specific.
It suggests a peptide associated mainly with the intestine.
In reality, VIP is a 28-amino-acid neuropeptide studied across a much broader range of biological signaling systems, including receptor biology, neuronal communication, gastrointestinal physiology and cellular signaling.
That makes VIP research peptide particularly interesting for laboratories investigating Class B G-protein-coupled receptors and peptide–receptor interactions.
What Is Vasoactive Intestinal Peptide?
Vasoactive Intestinal Peptide, also called Vasoactive Intestinal Polypeptide, is a naturally occurring peptide consisting of 28 amino acids.
Key identifiers include:
- Product name: Vasoactive Intestinal Peptide (VIP)
- Related name: Aviptadil
- CAS: 37221-79-7
- Molecular formula: C147H237N43O43S
- Molecular weight: approximately 3326.8 g/mol
- Sequence length: 28 amino acids
- Research category: Neuropeptide and receptor-signaling research
The human VIP sequence is:
HSDAVFTDNYTRLRKQMAVKKYLNSILN
This compact sequence participates in surprisingly diverse signaling research.
VPAC1 and VPAC2: Why VIP Has Broad Research Relevance
Two receptors are particularly important in VIP peptide research:
VPAC1 and VPAC2.
Both belong to the Class B family of G-protein-coupled receptors.
Research has shown that VIP binding to these receptors can activate G-protein-dependent pathways involving adenylate cyclase and intracellular cAMP signaling.
This explains why researchers studying VIP often also search for:
VPAC1 receptor, VPAC2 receptor, VIP GPCR signaling, adenylate cyclase and cAMP signaling.
VIP therefore provides a useful experimental peptide for studying receptor activation rather than only one specific physiological function.
VIP and PACAP Are Related—but Not Identical
Another frequent research topic is VIP vs PACAP.
VIP and pituitary adenylate cyclase-activating peptide (PACAP) share important receptor biology.
Both interact with VPAC1 and VPAC2 receptors, while PACAP also has strong activity at its own PAC1 receptor.
For laboratories performing receptor pharmacology or peptide–receptor studies, this distinction matters because related neuropeptides should not automatically be treated as interchangeable experimental materials.
What About Aviptadil?
The name Aviptadil frequently appears alongside Vasoactive Intestinal Peptide in scientific and clinical searches.
This creates another important distinction for research buyers.
Clinical studies involving a specific aviptadil formulation tell researchers about that particular material, formulation, delivery route and study population.
They do not automatically establish the quality, regulatory status or biological performance of every research material marketed under the broader VIP name.
For laboratory procurement, clinical literature and research-material characterization should therefore be evaluated separately.
Online Reviews Are Not Analytical Evidence
Search results for VIP peptide also include personal experiences.
Some users report positive subjective experiences, while others describe flushing or poor tolerability.
These reports can explain public search interest, but they cannot establish molecular identity, purity or experimental reproducibility.
For laboratories, a better question is:
What analytical evidence accompanies the supplied peptide?
What Should Researchers Check When Sourcing VIP Peptide?
HPLC Purity
VIP peptide HPLC analysis can provide information about chromatographic purity and peptide-related components.
Batch-level results are more useful than a generic purity statement alone.
Molecular Identity
Purity and molecular identity are not the same measurement.
Appropriate analytical methods can help confirm whether supplied material corresponds to the expected Vasoactive Intestinal Peptide molecule.
Batch-Specific COA
A VIP peptide Certificate of Analysis (COA) should ideally identify the relevant production batch and applicable analytical specifications.
This helps laboratories connect experimental material with its quality documentation.
Sequence and Specifications
Because VIP is a defined 28-amino-acid peptide, sequence information, molecular specifications and storage conditions should be clearly documented before experimental use.
Sunone Vasoactive Intestinal Peptide (VIP)
Sunone (Hong Kong) Biopharmaceutical International Technology Co., Limited supplies Vasoactive Intestinal Peptide for qualified laboratory, analytical and manufacturing applications.
Current Sunone VIP specifications include:
- CAS 37221-79-7
- 28-amino-acid sequence
- ≥99% HPLC specification
- Lyophilized peptide format
- 5 mg and 10 mg research formats
- Certificate of Analysis documentation
- Safety Data Sheet
- Product specification documentation
- Storage at 2–8°C, protected from light
View the Sunone Vasoactive Intestinal Peptide (VIP) research peptide product page for current specifications and B2B sourcing information.
For biotechnology companies comparing a VIP peptide supplier, Aviptadil supplier or research peptide manufacturer, molecular identity, peptide sequence, HPLC purity and batch traceability provide more useful procurement information than online testimonials.
Final Perspective
Vasoactive Intestinal Peptide is a good example of why peptide names do not always reveal the full scope of their biology.
VIP is not simply an “intestinal peptide.”
Its interaction with VPAC1, VPAC2, GPCR signaling and cAMP pathways has made it relevant to a much broader field of neuropeptide and receptor research.
For scientific buyers, that broad biological interest makes accurate analytical characterization especially important.
Before starting a VIP research project, the key questions remain:
Is the peptide identity clear?
Does the sequence match the expected VIP molecule?
Is HPLC purity supported by batch data?
And can the supplied lot be traced to appropriate analytical documentation?
Those questions create a stronger foundation for reproducible VIP peptide research.
This content is provided for scientific and educational purposes only. SUNONE research peptide is for qualified labrtorynt, diagnois, druc tor mmatct or veteimant, use.research only, Not for human consumption, clinical treame. Purchasers are responsible for complying with applicable laws and regulations in their jurisdiction.
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