GHRP-2 // Maximum GH Output
One of the most potent growth hormone-releasing peptides available. GHRP-2 stimulates the ghrelin receptor (GHS-R1a) to produce a robust GH spike — reportedly up to 7–15x baseline. The trade-off: it also elevates cortisol and prolactin more than Ipamorelin, making it a high-output, higher-side-effect option best reserved for users who need maximum GH release.
The ghrelin pathway — raw GH release.
GHRP-2 is a synthetic hexapeptide that acts as a potent ghrelin mimetic, binding the growth hormone secretagogue receptor (GHS-R1a). Unlike GHRH analogs that tell the pituitary to produce GH, GHRP-2 triggers the release of stored GH vesicles. It also amplifies the GHRH signal when combined — this synergy is why GHRH + GHRP combinations produce more GH than either alone.
Dose it smart — the side effects are dose-dependent.
GHRP-2 is dosed 2–3 times daily on an empty stomach (fasting or 2+ hours post-meal). The GH response is dose-dependent, but so are cortisol and prolactin — keeping individual doses at 100–200mcg balances output vs. side effects. The sweet spot for most users is 100–150mcg per dose combined with a GHRH analog.
The potency-vs-selectivity trade-off.
GHRP-2 was one of the first synthetic growth hormone-releasing peptides developed, following the discovery of the ghrelin receptor. Studies demonstrate a dose-dependent GH release reaching 7–15x baseline levels at optimal doses — significantly more than Ipamorelin's 5–8x.
The primary limitation is lack of selectivity. Unlike Ipamorelin (which produces GH with minimal cortisol and prolactin), GHRP-2 activates broader signaling pathways. At 100mcg, cortisol elevation is modest (~15–20% increase); at 200–300mcg, it becomes more pronounced. Prolactin increases are consistent but generally not clinically significant at standard doses.
GHRP-2 has been approved in Japan as Pralmorelin for diagnostic evaluation of GH secretion. Clinical use beyond diagnostics remains off-label worldwide. The compound is well-characterized pharmacologically with decades of research data.
GHRP-2 vs. the other GHRPs.
| Compound | GH Output | Cortisol | Prolactin | Appetite |
|---|---|---|---|---|
| Ipamorelin | Moderate (~5x) | None | None | None |
| GHRP-2 | Strong (~10x) | Moderate | Moderate | Mild |
| GHRP-6 | Strong (~10x) | Significant | Significant | Severe |
| Hexarelin | Strongest (~15x) | Significant | Significant | Moderate |
| MK-677 | Moderate (~5x) | None | None | Significant |
What to watch for.
GHRP-2's side effect profile is manageable with proper protocol adherence. Baseline blood work before starting and periodic monitoring during use is essential.
- Cortisol elevation (dose-dependent — keep doses ≤200mcg to minimize)
- Prolactin elevation (dose-dependent, generally mild at standard doses)
- Increased appetite (less than GHRP-6 but present)
- Water retention (GH-mediated)
- Flushing and warmth after injection
- Tingling in extremities
- Lethargy if cortisol spikes (dose too high)
- Vivid dreams
- IGF-1 (primary efficacy marker)
- Cortisol (morning draw — critical to monitor with GHRP-2)
- Prolactin (check at baseline and 6–8 weeks)
- Fasting glucose and insulin
- HbA1c (every 3 months)
- Thyroid panel
- CBC and CMP
- DEXA for body composition tracking
- ALWAYS combine with a GHRH analog (CJC-1295 or Sermorelin) for synergistic output
- BPC-157 for tissue repair support
- DSIP for sleep optimization
- Do NOT combine with GHRP-6 or Hexarelin (redundant GHRPs)
- Do NOT combine with exogenous HGH
- Consider P5P (active B6) to manage prolactin if needed
- Lyophilized: refrigerate at 2–8°C (36–46°F)
- Reconstituted: refrigerate, use within 28 days
- Protect from light and heat
- Do not freeze reconstituted solution
- Stable peptide after reconstitution
- Research grade: confirm ≥98% HPLC purity on COA
Compounds that complement GHRP-2.
Maximum output — if you can manage the cortisol trade-off.
GHRP-2 is the choice when you want significantly more GH than Ipamorelin provides but don't want the appetite explosion of GHRP-6 or the desensitization risk of Hexarelin. The cortisol and prolactin elevation are real but manageable at 100–200mcg doses. Always combine with a GHRH analog, always dose on an empty stomach, always monitor cortisol and prolactin. If you find the side effects too noticeable, step back to Ipamorelin — it's cleaner even though it's weaker.
Our free Protocol Guide includes the complete GHRP-2 + CJC-1295 protocol with cortisol management, dosing, and blood work panels.