GHRP-2
GHRP-2 (Pralmorelin) operates as the distinct middle ground in the secretagogue hierarchy—it is aggressively more potent at inducing total Growth Hormone release than GHRP-6, yet it triggers substantially less hunger and gastric motility. Extensively utilized in both pediatric GH deficiency studies and extreme anabolism protocols, GHRP-2 offers a colossal GH spike ideal for maximizing IGF-1 conversion, though its power comes with an observable, transient increase in secondary stress hormones.
Quick Stats
Scientific Data
Mechanism of Action
GHRP-2 is a synthetic hexapeptide and second-generation growth hormone releasing peptide. It is the most potent of the GHRP family for GH release. Like GHRP-6, it activates the ghrelin receptor (GHS-R1a), but with a higher binding affinity. GHRP-2 produces stronger GH pulses than GHRP-6 with a moderately lower appetite stimulation effect (though still greater than Ipamorelin).
GHRP-2 also elevates cortisol and prolactin more than Ipamorelin but less than Hexarelin. It does not exhibit desensitization at standard doses over typical cycle lengths.
Source: PMID: 9003422
Background & History
GHRP-2 (Pralmorelin) is the most potent stimulator of the GHRP family. It was extensively studied as a diagnostic tool for GH deficiency and reached clinical trial stage in Japan (Kaken Pharmaceutical) in the early 2000s. Its higher binding affinity for GHS-R1a versus GHRP-6 translates to 20–30% greater peak GH release. The moderate appetite stimulation (lower than GHRP-6) and stronger GH output make it popular for performance-focused protocols.
Research Use Cases
- ✓Maximum GH pulse output for performance and anabolic goals
- ✓GH deficiency testing (clinical diagnostic use)
- ✓Body composition optimization with moderate appetite increase
- ✓Recovery protocols requiring aggressive GH stimulation
Dosing Protocol
| Typical Dose | 100-300 mcg/injection |
| Frequency | 2-3× daily |
| Half-Life | 15-60 minutes |
| Common Vial Sizes | 5 mg |
Dosing Protocols
Standard Protocol
Body-Weight Dosing Reference
Estimated doses extrapolated from the published research range of 100–300 mcg/day (referenced to 70 kg / 154 lb). These are approximations — consult a qualified healthcare provider for personalised guidance.
| Weight | Low Dose | Target Dose | High Dose |
|---|---|---|---|
| 120 lb(54 kg) | 77 mcg | 154 mcg | 231 mcg |
| 140 lb(63 kg) | 90 mcg | 180 mcg | 270 mcg |
| 160 lb(73 kg) | 104 mcg | 209 mcg | 313 mcg |
| 180 lb(82 kg) | 117 mcg | 234 mcg | 351 mcg |
| 200 lb(91 kg) | 130 mcg | 260 mcg | 390 mcg |
| 220 lb(100 kg) | 143 mcg | 286 mcg | 429 mcg |
| 250 lb(113 kg) | 161 mcg | 323 mcg | 484 mcg |
💉 For exact syringe units based on your vial concentration, use the GHRP-2 Reconstitution Calculator →
Administration
Expected Timeline
Who Is It For?
GH Optimization (Max Output)
HighMost potent GHRP by raw GH release. Best for users who want maximum secretagogue effect.
Body Recomposition
ModerateStrong GH pulse with moderate appetite effect — middle ground between GHRP-6 and Ipamorelin.
Reconstitution Example
Safety & Considerations
Research peptide. Moderately stimulates appetite, cortisol, and prolactin. Less appetite stimulation than GHRP-6 but more than Ipamorelin. Use on an empty stomach for optimal GH pulse.
Regulatory & Legal Status
Competitive athletes subject to anti-doping controls should not use GHRP-2.
Research Chemical
US Compounding: Not eligible / not available
⚠️ This information is for educational purposes only and may not reflect the most current regulatory updates. Always verify with official FDA, WADA, and jurisdiction-specific sources before use.
Interactions & Contraindications
Greater cortisol elevation than Ipamorelin — not ideal for chronic stress or adrenal fatigue contexts. Prolactin elevation may affect libido/sexual function in some users. Empty stomach required for effective dosing.
Synergies & Common Stacks
Most potent GHRH+GHRP stack for raw GH output. Best for anabolic or aggressive recovery protocols where cortisol elevation is acceptable.
Dosing Quick Reference
Frequently Asked Questions
Is GHRP-2 stronger than GHRP-6?▼
What is the GHRP-2 dosing protocol?▼
References
- Bowers CY “"Growth hormone-releasing peptides".” Journal of Pediatric Endocrinology & Metabolism (1993). PMID: 8186715
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