Growth & hormones · ~3 min read
VIP: What It Is, How It Works & What the Research Shows
Overview
VIP (vasoactive intestinal peptide) is a 28-amino-acid neuropeptide found throughout the gut, brain, lungs and immune system. It relaxes blood vessels and smooth muscle, regulates gut secretions, and has strong anti-inflammatory effects. A synthetic form (aviptadil) has been studied for acute lung injury, and intranasal VIP is used by some clinicians for chronic inflammatory response syndrome (CIRS).
Why researchers study it
Inflammation
Strong anti-inflammatory effects across tissues.
Lung health
Synthetic form (aviptadil) studied for acute lung injury.
CIRS
Used intranasally by some clinicians for CIRS.
How it works
Vasoactive intestinal peptide activates VPAC receptors, affecting cyclic-AMP signaling, vascular tone and immune responses. Systemic vasodilation is also clinically relevant to safety.
Adamantane & the blood–brain barrier
Chemically attaching an adamantane group to a peptide can increase its lipid (fat) solubility. Researchers hypothesize that this modification may help certain compounds cross the tightly regulated blood–brain barrier. The effect depends on the specific modified molecule; greater lipid solubility alone does not establish brain delivery or clinical benefit. This does not apply automatically to the unmodified peptide and is not a reconstitution additive.
What the research shows
- Vascular tone, immune signaling, and pulmonary effects are research areas.
- Aviptadil has been studied in selected severe respiratory conditions.
Typical protocol
Reconstitute a 10 mg vial with 3 mL bacteriostatic water for 3.3333 mg/mL. Typical range: 50–150 mcg 1–2x daily (am and pm) · daily, 4–12 weeks.
Potential benefits & side effects
Potential benefits
- Faster recovery from soft tissue injuries (tendons, ligaments, muscle)
- Reduced inflammation and joint discomfort
- Gut lining support (BPC-157 and KPV)
- Improved skin quality and wound healing (GHK-Cu blends)
Side effects
- Injection-site redness, itching or mild swelling
- Temporary fatigue or lightheadedness
- Headache or mild nausea
- Copper-peptide blends can sting at the injection site
Lifestyle factors
- Load gradually: healing tissue still needs controlled, progressive loading — don't rush back to max effort.
- Sleep: most tissue repair happens during deep sleep.
- Nutrition: protein, vitamin C and collagen-supporting foods help connective tissue rebuild.
- Limit alcohol and smoking, which slow healing.
- Rotate injection sites; some inject near (not into) the injured area.