Critical illness trial, 2002
A trial in 33 men with prolonged critical illness reported that GHRP-2 with TRH and GnRH reactivated several hormone axes more than GHRP-2 used alone. Reported in the cited paper.
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Growth Hormone
GHRP-2
GHRP-2 is a synthetic hexapeptide growth hormone secretagogue acting on the ghrelin receptor. Under the name pralmorelin it is used clinically in Japan as a diagnostic agent for growth hormone deficiency, which is its best supported application.
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Overview
What is GHRP-2?
GHRP-2 is a synthetic hexapeptide growth hormone secretagogue acting on the ghrelin receptor. Under the name pralmorelin it is used clinically in Japan as a diagnostic agent for growth hormone deficiency, which is its best supported application.
- GH Support
- Diagnostic Testing
- Recovery
- Appetite
What the research reports
Reported benefits of GHRP-2
Outcomes described across the published GHRP-2 literature and ongoing study. Read each as research context rather than a promised personal result.
- 01
Strong GH pulse production
Produces a stronger and more selective growth hormone pulse than GHRP-6, with less hunger and lower cortisol and prolactin elevation. Reported in research settings.
- 02
Diagnostic test reliability
Pralmorelin reliably separates growth hormone deficient patients from healthy controls using a peak cutoff of 15.0 micrograms per litre. Reported in research settings.
- 03
Alternative to insulin testing
A 2013 cohort found the GHRP-2 and arginine tests acceptable alternatives to the insulin tolerance test for diagnosing adult deficiency. Reported in research settings.
- 04
Defined saturation dose limit
Published work places the saturation dose near 100 mcg, roughly 1 mcg per kilogram, above which returns diminish sharply. Reported in research settings.
- 05
Synergy with GHRH analogue use
Combining with a GHRH analogue produces a larger pulse than either pathway on its own, which underpins most stacked protocols. Reported in research settings.
Dosage and protocol
How GHRP-2 is typically studied
Research protocols use 100 to 300 mcg subcutaneously two or three times daily. Doses above 300 mcg raise cortisol and prolactin. Figures describe study protocols, not a personal regimen.
- Route
- Subcutaneous injection
- Example range
- 100-200 mcg
- Frequency
- Three times daily
- Timing
- Empty stomach, 30 minutes before meals or 2 hours after. Food blunts the GH release.
Clinical evidence
GHRP-2 clinical evidence summary
The published GHRP-2 record, labeled by strength so you can see what is settled and what is still emerging.
Phase 1 study in children
A 1998 phase 1 study in 10 children reported predictable and significant increases in growth hormone after GHRP-2 administration over a two hour window. Reported in the cited paper.
SourceDiagnostic comparison, 2013
A cohort of 71 Japanese patients found the arginine and GHRP-2 tests acceptable alternatives to the insulin tolerance test for adult deficiency diagnosis. Reported in the cited paper.
SourceInteractions
How GHRP-2 pairs with other peptides
- CJC-1295 blend
- Synergistic for GH release. GHRH analogue plus ghrelin mimetic amplifies the pulse through two pathways.
- Hexarelin GH
- Both act on the ghrelin receptor, so combining duplicates one target and raises cortisol and prolactin.
- Ipamorelin
- Same receptor family. Stacking adds little beyond what a single ghrelin mimetic already achieves.
- MK-677 oral
- Stacking oral and injectable secretagogues raises IGF-1 and insulin resistance risk considerably.
Questions
Frequently asked questions.
What is GHRP-2?
GHRP-2 is a peptide compound used in research settings. It is commonly studied for its role in growth hormone, and many researchers compare supplier quality, purity, and testing data before purchasing.
What are the research benefits of GHRP-2?
GHRP-2 is often evaluated for its potential influence on signaling pathways, recovery support, and targeted research applications. Research interest varies by peptide, formulation, and study design, so buyers typically review purity, dose, and independent lab verification before choosing a source.
How does GHRP-2 work?
Like other research peptides, GHRP-2 is typically studied for how it interacts with specific biological pathways and receptor systems. In practice, the way it is formulated, dosed, and tested matters as much as the compound itself, which is why verified suppliers and transparent COAs are important.
Is GHRP-2 for research use only?
Yes, products like GHRP-2 are generally intended for research, laboratory, or educational use and are not marketed as approved human therapeutics. Always follow local laws, lab safety practices, and institutional requirements before handling or studying any peptide.
What should I look for before buying GHRP-2?
Key checks include verified COA data, peptide form and concentration, supplier reputation, stock status, and cost per mg. Comparing pricing and testing records side-by-side helps reduce the risk of buying an under-tested or misrepresented product.
