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GHRP-2: the complete guide

GHRP-2 is a synthetic ghrelin receptor agonist that strongly stimulates growth hormone release. It is often paired with a GHRH analog to amplify GH pulses.

Written by Peptide Protocol Editorial Medically reviewed per our review process Last reviewed
ClassGhrelin-mimetic growth hormone secretagogue
Half-lifeApproximately 15–60 minutes
Typical dose100–300 mcg per injection, up to 3x daily
CategoryGH secretagogue (GHRP)
Research useGH pulse research, appetite stimulation studies
FDA statusNot FDA approved for therapeutic use. Used as a diagnostic agent for GH deficiency in some countries. Research use only in the US.

How GHRP-2 works

GHRP-2 binds the growth hormone secretagogue receptor (GHS-R), mimicking ghrelin to trigger GH release from the pituitary while also modestly stimulating appetite via hypothalamic pathways.

Typical GHRP-2 dosage

Commonly reported research ranges: 100–300 mcg per injection, up to 3x daily.

Dose should always be individualized. Factors that influence it include bodyweight, research goal, tolerance, and specific compound batch. The information below is educational, not a prescription.

How to reconstitute GHRP-2

A widely used reconstitution for a 5 mg vial is 2 ml of bacteriostatic water. With a typical 100 mcg dose this works out to the unit count shown in the calculator below.

Open the GHRP-2 reconstitution calculator →

Pre-filled with the common 5 mg + 2 ml ratio. Adjust for your own vial.

Half-life and administration frequency

Approximately 15–60 minutes.

This half-life informs how often GHRP-2 is typically dosed. Shorter half-lives usually mean more frequent dosing to maintain plasma levels; longer half-lives allow daily, weekly, or less-frequent administration depending on the compound.

Reported side effects

This list reflects effects reported in available literature or user logs. It is not exhaustive. Adverse reactions should be discussed with a qualified clinician.

Common GHRP-2 stacks

Full editorial stack guides featuring GHRP-2:

Sermorelin + GHRP-2

Sleep-anchored GH pulse, users who prefer FDA-precedent compounds, clinical anti-aging protocols.

GH axisClinical

Storage and handling

Lyophilized refrigerated. Reconstituted: refrigerated, use within 28 days.

FDA and regulatory status

Not FDA approved for therapeutic use. Used as a diagnostic agent for GH deficiency in some countries. Research use only in the US.

GHRP-2 clinical trials and evidence

For clinical-trial and primary-literature context, start with the sources below. We prioritize official drug labels, ClinicalTrials.gov records, and PubMed-indexed literature when available.

Track your GHRP-2 protocol on iPhone

Peptide Protocol logs every dose, calculates reconstitution for you, and keeps your full protocol on one calm screen.

See the app →

Frequently asked questions

What is GHRP-2?

GHRP-2 is a synthetic ghrelin receptor agonist that strongly stimulates growth hormone release. It is often paired with a GHRH analog to amplify GH pulses.

How does GHRP-2 work?

GHRP-2 binds the growth hormone secretagogue receptor (GHS-R), mimicking ghrelin to trigger GH release from the pituitary while also modestly stimulating appetite via hypothalamic pathways.

What is a typical GHRP-2 dose?

Commonly reported ranges are 100–300 mcg per injection, up to 3x daily. This is research information, not a recommendation — dosing should be individualized under clinical guidance.

What is the half-life of GHRP-2?

Approximately 15–60 minutes. This influences how often it is administered.

How do you reconstitute GHRP-2?

A common approach is to add 2 ml of bacteriostatic water to a 5 mg vial. Use the reconstitution calculator for exact unit counts.

What are the side effects of GHRP-2?

Increased hunger (significant); Transient elevated cortisol and prolactin; Water retention; Tingling or flushing.

Is GHRP-2 FDA approved?

Not FDA approved for therapeutic use. Used as a diagnostic agent for GH deficiency in some countries. Research use only in the US.

Are there clinical trials for GHRP-2?

Registered or published clinical-trial sources for GHRP-2 are listed in the references section below. Evidence depth varies widely by compound, so check the cited trial registries and primary literature before relying on any claim.

References

  1. GHRP-2 literature (PubMed) — National Library of Medicine. Primary studies on growth-hormone-releasing peptide 2
  2. Bowers et al. — GHRP-2 pharmacology — PubMed. Foundational characterization by the group that discovered GHRPs
  3. GHRP-2 clinical trial records — ClinicalTrials.gov. Registered human studies

Sources listed above were used to verify the claims on this page. See our editorial policy for how we source information.

Educational use only. Peptide Protocol is an informational tool. Nothing on this page constitutes medical advice. Many peptides are prescription-only or restricted in your jurisdiction. Always consult a licensed healthcare professional before injecting any compound.