What Is GHRP-2?
GHRP-2 (Growth Hormone Releasing Peptide-2) is classified as a ghrp peptide. Synthetic hexapeptide GH secretagogue acting on the GHSR1a receptor. GHRP-2 produces the most potent GH release among standard GHRPs (stronger than GHRP-6 or Ipamorelin) but with moderate increases in cortisol and prolactin. Approved in Japan as a diagnostic tool for GH deficiency (trade name: Pralmorelin/GHRP Kaken).
It is extensively evaluated in laboratory and clinical settings for its potential to drive strongest gh release of standard ghrps, muscle growth, anti-aging, recovery. Researchers target GHRP-2 for its ability to interact with specific cellular and molecular pathways, making it a compound of significant interest across multiple therapeutic domains.
The most potent standard GHRP. Approved in Japan as a diagnostic tool (Pralmorelin). Raises cortisol and prolactin more than Ipamorelin but less than Hexarelin. Not FDA-approved for therapeutic use.
How Does GHRP-2 Work?
Synthetic hexapeptide GH secretagogue acting on the GHSR1a receptor. GHRP-2 produces the most potent GH release among standard GHRPs (stronger than GHRP-6 or Ipamorelin) but with moderate increases in cortisol and prolactin. Approved in Japan as a diagnostic tool for GH deficiency (trade name: Pralmorelin/GHRP Kaken).
At the molecular level, GHRP-2 operates through pathways characteristic of the GHRP class. By interacting with target receptors and downstream signaling cascades, the compound initiates biological responses associated with strongest gh release of standard ghrps, muscle growth, anti-aging, recovery.
Expected Research Timeline
Weeks 2–4
Enhanced recovery; early body composition shifts; IGF-1 elevation on bloodwork
Months 2–3
Significant lean mass improvement; fat redistribution; skin quality enhancement
Long-Term
Sustained somatotropic axis support; cycling recommended every 12-16 weeks
What Does the Research Say?
The following are key findings from peer-reviewed studies on GHRP-2, indexed on PubMed and equivalent databases:
[1]GHRP-2 potent GH release in healthy adults
Arvat et al. (J. Clin. Endocrinol. Metab.): GHRP-2 produces the strongest GH response among tested GHRPs in healthy adults, with dose-dependent effects and moderate prolactin/cortisol elevation.
Evidence: moderate[2]GHRP-2 approved diagnostic agent for GH deficiency
Clinical validation of GHRP-2 (Pralmorelin) as a diagnostic GH provocative test in Japan, showing reliable, reproducible GH stimulation for diagnosing adult GH deficiency.
Evidence: strong[3]GHRP-2 effects on sleep and nocturnal GH secretion
Frieboes et al.: GHRP-2 enhances slow-wave sleep and amplifies nocturnal GH pulses in healthy young men, supporting pre-bed dosing protocols.
Evidence: moderate[4]GHRP-2 increases IGF-1 and lean mass in elderly
Bowers et al.: Chronic GHRP-2 administration in elderly subjects increases IGF-1, GH, and lean body mass while reducing fat mass.
Evidence: moderateSafety & Side Effects
The most potent standard GHRP. Approved in Japan as a diagnostic tool (Pralmorelin). Raises cortisol and prolactin more than Ipamorelin but less than Hexarelin. Not FDA-approved for therapeutic use.
| Side Effect | Incidence | Severity |
|---|---|---|
| Moderate appetite increase | ~30% of users | mild |
| Cortisol elevation (transient) | ~20% of users | mild |
| Prolactin elevation (transient) | ~15% of users | mild |
| Water retention | ~12% of users | mild |
| Drowsiness / fatigue | ~8% of users | mild |
FDA Status: Not Approved for Human Therapeutic Use
GHRP-2 is not currently FDA-approved for human use. It is available for research purposes only. Always consult a licensed healthcare provider.
How Is GHRP-2 Used?
Route
SubQ
Dose Range
100–300 mcg
Frequency
1-3x daily
Cycle
8–16 wk
Timing: Pre-bed, morning fasted
Notes: Most common dose: 150-300mcg per injection. Empty stomach required. Often considered the 'goldilocks' GHRP: stronger than Ipamorelin, fewer sides than GHRP-6.
All dosing information reflects parameters reported in published research literature and is not intended as clinical guidance. Usage of any peptide should be supervised by a qualified healthcare professional.
GHRP-2 vs. Related Compounds
Where to Source GHRP-2 for Research
Purchasing ultra-high purity, laboratory-grade peptides is critical for verifiable research. We only recommend vendors providing independent, third-party HPLC Certificates of Analysis (COA).
Disclosure: PeptiDex may earn a commission from purchases. This does not affect our recommendations. We exclusively feature vendors that pass our strict quality verification protocols.
Frequently Asked Questions
What is GHRP-2?
GHRP-2 is a ghrp peptide. Synthetic hexapeptide GH secretagogue acting on the GHSR1a receptor. GHRP-2 produces the most potent GH release among standard GHRPs (stronger than GHRP-6 or Ipamorelin) but with moderate increases in cortisol and prolactin. Approved in Japan as a diagnostic tool for GH deficiency (trade name: Pralmorelin/GHRP Kaken).
What are the primary research benefits of GHRP-2?
Published research identifies primary mechanisms targeting: Strongest GH release of standard GHRPs, muscle growth, anti-aging, recovery. These findings come from 4+ peer-reviewed studies indexed in our database.
What is the half-life of GHRP-2?
In published pharmacokinetic data, GHRP-2 demonstrates a half-life of approximately 1.5 hours.
Is GHRP-2 FDA approved?
GHRP-2 is not currently FDA-approved for human therapeutic use. It is classified as a research compound and is studied under investigational protocols. Always consult a healthcare provider.
What are common side effects of GHRP-2?
Reported side effects in published literature include Moderate appetite increase (~30% of users), Cortisol elevation (transient) (~20% of users), Prolactin elevation (transient) (~15% of users), Water retention (~12% of users), Drowsiness / fatigue (~8% of users). Most are classified as mild in severity.
How is GHRP-2 administered?
In research settings, GHRP-2 is typically administered via SubQ. Most common dose: 150-300mcg per injection. Empty stomach required. Often considered the 'goldilocks' GHRP: stronger than Ipamorelin, fewer sides than GHRP-6.
Sources
- GHRP-2 potent GH release in healthy adults. View on PubMed
- GHRP-2 approved diagnostic agent for GH deficiency. View on PubMed
- GHRP-2 effects on sleep and nocturnal GH secretion. View on PubMed
- GHRP-2 increases IGF-1 and lean mass in elderly. View on PubMed