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VP

VP

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VIP (Vasoactive Intestinal Peptide) is a 28‑amino‑acid neuropeptide found throughout the brain, gut, lungs, and immune system. It is not a bodybuilding or “research peptide” like BPC‑157 or TB‑500 — VIP is a naturally occurring human regulatory peptide with major roles in vasodilation, digestion, circadian rhythm, immune modulation, and anti‑inflammatory signaling.

? What VIP Is

  • A neuropeptide hormone in the glucagon/secretin peptide family.

  • Produced in the gut, pancreas, brain (especially the suprachiasmatic nucleus), lungs, and immune cells.

  • Binds to VPAC1 and VPAC2 receptors, activating cAMP‑PKA signaling pathways.

  • Half‑life in blood: ~2 minutes.

VIP is essential for smooth muscle relaxation, vasodilation, circadian rhythm regulation, and immune balance.

 

? Major Physiological Roles of VIP

1. Neurological & Circadian Rhythm Regulation

  • VIP is a key synchronizing signal in the suprachiasmatic nucleus (SCN) — the body’s master clock.

  • Helps maintain sleep–wake cycles and light‑entrainment.

  • VIP‑deficient animals show disrupted circadian rhythms.

2. Gastrointestinal Function

VIP strongly influences digestion by:

  • Relaxing GI smooth muscle

  • Increasing secretion of water/electrolytes into the intestine

  • Stimulating pancreatic bicarbonate secretion

  • Inhibiting gastric acid secretion

  • Increasing motility

3. Cardiovascular Effects

  • Potent vasodilator

  • Increases coronary blood flow

  • Has positive inotropic and chronotropic effects on the heart

4. Immune Modulation

VIP has strong anti‑inflammatory properties:

  • Regulates cytokine release

  • Modulates mast‑cell activity (important in IBD)

  • Helps maintain immune homeostasis

5. Metabolic & Appetite Regulation

VIP‑deficient mice show:

  • Lower body weight

  • Reduced fat mass

  • Altered feeding patterns

  • Disrupted metabolic hormone secretion (GLP‑1, leptin, insulin, PYY)

 

? VIP in Research & Medicine

Clinical Use: VIPoma Diagnosis

VIP is clinically measured when diagnosing VIPoma, a rare pancreatic tumor that secretes excessive VIP and causes:

  • Severe watery diarrhea

  • Low potassium

  • Dehydration

Therapeutic Research Areas

VIP is being studied for:

  • IBD (Crohn’s, ulcerative colitis)

  • Asthma & pulmonary hypertension

  • Heart failure

  • Neurodegenerative diseases

  • Autoimmune disorders

Its anti‑inflammatory and vasodilatory properties make it a promising therapeutic target.

 

? Is VIP used as a peptide supplement?

Unlike peptides such as BPC‑157, TB‑500, or P21, VIP is not commonly sold in the research‑peptide market because:

  • It is biologically fragile

  • Has a very short half‑life

  • Requires specialized formulation for stability

  • Is regulated more strictly due to its systemic effects

Most VIP research uses pharmaceutical‑grade formulations, not typical peptide‑vendor products.

 

? Summary

VIP is a powerful endogenous neuropeptide with wide‑ranging effects on:

  • Digestion

  • Blood flow

  • Circadian rhythm

  • Immune regulation

  • Metabolism

It is not a typical “performance peptide” but a core human regulatory hormone with major physiological importance.

 
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