Peptide Research Index
⚠️ Educational only · Not medical advice · Consult a doctor · Most peptides are research-only / not FDA-approved for human use
⚠️ Educational only · Not medical advice · Consult a doctor · Most peptides are research-only / not FDA-approved for human use
Also: Growth Hormone Releasing Peptide-6, His-D-Trp-Ala-Trp-D-Phe-Lys-NH2
GHRPLast Updated: April 1, 2026
GHRP-6 (also known as Growth Hormone Releasing Peptide-6, His-D-Trp-Ala-Trp-D-Phe-Lys-NH2) is a prominently researched experimental compound classified strictly within the GHRP framework. Operating primarily through advanced pharmacological pathways, it functions by synthetic hexapeptide that stimulates GH release by acting on the ghrelin/GHS receptor (GHSR1a) in the pituitary and hypothalamus. Unlike Ipamorelin, GHRP-6 is non-selective and also stimulates appetite (via ghrelin mimicry), raises cortisol and prolactin modestly, and has notable gastric motility effects. One of the earliest and most well-studied GH secretagogues. with a documented biological half-life of roughly 2.5 hours, in preclinical investigative trials and independent academic studies, researchers utilizing GHRP-6 have documented significant, quantifiable biological outcomes, primarily focusing on potent gh release, appetite stimulation, muscle growth, recovery, gastric motility. Typical research protocols investigate administering 100 to 300mcg via subq pathways 1-3x daily. However, it is critically important to understand that while GHRP-6 demonstrates profound physiological potential in highly controlled laboratory settings, it remains classified strictly as a research chemical and has not been approved by the United States Food and Drug Administration (FDA) for human therapeutic, diagnostic, or dietary consumption. Independent chemical analysis via rigorous third-party Certificate of Analysis (COA) testing utilizing High-Performance Liquid Chromatography (HPLC) and Mass Spectrometry (MS) remains the industry gold standard for verifying its base elemental stability when reconstituted appropriately in sterile bacteriostatic water.
Synthetic hexapeptide that stimulates GH release by acting on the ghrelin/GHS receptor (GHSR1a) in the pituitary and hypothalamus. Unlike Ipamorelin, GHRP-6 is non-selective and also stimulates appetite (via ghrelin mimicry), raises cortisol and prolactin modestly, and has notable gastric motility effects. One of the earliest and most well-studied GH secretagogues.
Bowers et al. (Endocrine Reviews): Comprehensive characterization of GHRP-6 showing dose-dependent GH release in humans with peak response at 1-2mcg/kg IV. Established GHRP-6 as the prototype GH secretagogue.
moderateCombined GHRP-6 + GHRH produces synergistic GH release 3-5x greater than either peptide alone, demonstrating distinct receptor mechanisms.
moderateBerlanga et al.: GHRP-6 demonstrates significant cardioprotective effects in myocardial ischemia-reperfusion injury models, reducing infarct size and oxidative damage independent of GH release.
preclinicalStudy confirms GHRP-6 activates ghrelin receptors in the GI tract, increasing gastric emptying rate and appetite. Clinically relevant for cachexia/wasting conditions.
moderateWell-studied but less selective than Ipamorelin. Raises cortisol (~15-20% transient) and prolactin modestly. Strong appetite stimulation can be a benefit (cachexia) or side effect (body composition goals). Not FDA-approved.
⚠️ For educational purposes only. Not medical advice. Consult a healthcare professional before using any peptide.
Standard research dose: 100-300mcg per injection. Must be taken on empty stomach (food blunts GH release by ~75%). Appetite surge hits within 20-30 minutes of injection.
Week 1
Intense appetite increase; improved sleep depth; possible cortisol-related water retention
Weeks 2-4
Elevated GH confirmed on bloodwork; faster recovery; early lean mass shifts
Month 2-3
Measurable body composition improvement; sustained appetite increase; IGF-1 elevation
Long-term
Continued GH axis support; may develop mild tachyphylaxis requiring cycling
| Side Effect | Incidence | Severity |
|---|---|---|
Intense hunger / appetite surge Onset within 20-30 min of injection; strongest GHRP for appetite | ~60-80% of users | moderate |
Water retention | ~20% of users | mild |
Cortisol elevation (transient) 15-20% transient spike; returns to baseline within 1-2 hours | ~15% of users | mild |
Tingling / numbness | ~8% of users | mild |
Headache | ~5% of users | mild |
Incidence rates sourced from published clinical trial data where available; otherwise based on community research observations.
Finding verified, high-purity GHRP-6 requires rigorous COA verification. We independently evaluate vendors based on third-party HPLC testing, purity thresholds (≥98%), and batch-specific documentation.
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PeptiDex. (2026). GHRP-6. PeptiDex Research Platform. https://peptidex.app/library/ghrp-6
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