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: Examorelin, HEX
GHRPLast Updated: April 1, 2026
Hexarelin (also known as Examorelin, HEX) is a prominently researched experimental compound classified strictly within the GHRP framework. Operating primarily through advanced pharmacological pathways, it functions by synthetic hexapeptide and the most potent GH secretagogue in the GHRP class. Acts on GHSR1a to produce the strongest acute GH pulse, but also significantly raises cortisol, prolactin, and ACTH. Notable for direct cardioprotective effects independent of GH release, binding to cardiac CD36 receptors to protect against ischemic damage. Develops tachyphylaxis (desensitization) faster than other GHRPs. with a documented biological half-life of roughly 0.9 hours, in preclinical investigative trials and independent academic studies, researchers utilizing Hexarelin have documented significant, quantifiable biological outcomes, primarily focusing on most potent gh release of any ghrp, cardioprotection, muscle growth, recovery. Typical research protocols investigate administering 100 to 200mcg via subq pathways 1-2x daily. However, it is critically important to understand that while Hexarelin 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 and the most potent GH secretagogue in the GHRP class. Acts on GHSR1a to produce the strongest acute GH pulse, but also significantly raises cortisol, prolactin, and ACTH. Notable for direct cardioprotective effects independent of GH release, binding to cardiac CD36 receptors to protect against ischemic damage. Develops tachyphylaxis (desensitization) faster than other GHRPs.
Ghigo et al. (J. Clin. Endocrinol. Metab.): Direct comparison study showing Hexarelin produces the highest peak GH response of any GHRP, significantly exceeding GHRP-6 and GHRP-2 in healthy subjects.
moderateBhatt et al.: Hexarelin binds cardiac CD36 scavenger receptors, providing direct cardioprotection independent of GH release. Reduces infarct size and improves cardiac function post-ischemia.
preclinicalBisi et al.: Chronic Hexarelin administration improves left ventricular ejection fraction and cardiac performance in GH-deficient adult patients.
moderateArvat et al.: Long-term Hexarelin use shows progressive GH response attenuation after 4-8 weeks of continuous dosing, necessitating cycling protocols for sustained efficacy.
moderateMost potent but least selective GHRP. Significant cortisol and prolactin elevation limits chronic use. Develops tachyphylaxis within 4-8 weeks requiring mandatory cycling. Cardioprotective properties make it uniquely valuable for cardiac research. Not FDA-approved.
⚠️ For educational purposes only. Not medical advice. Consult a healthcare professional before using any peptide.
Shorter cycles than other GHRPs (4-8 weeks max) due to tachyphylaxis. Standard dose: 100-200mcg. Often used in short 'burst' protocols for maximum GH output. Always cycle: 4 weeks on / 4 weeks off minimum.
Week 1
Dramatic GH pulse; notable flush and warmth sensation; improved sleep depth
Weeks 2-4
Peak body composition effects; strongest anabolic window; IGF-1 significantly elevated
Month 2-3
Tachyphylaxis onset; GH response diminishes 40-60% by week 6-8; must cycle off
Long-term
Best used cyclically; cardiac benefits may persist beyond GH effects
| Side Effect | Incidence | Severity |
|---|---|---|
Cortisol elevation More significant than other GHRPs; monitor with chronic use | ~30% of users | moderate |
Prolactin elevation Can cause nipple sensitivity; necessitates cycling | ~25% of users | moderate |
Intense flushing / warmth | ~20% of users | mild |
Appetite increase | ~15% of users | mild |
Water retention | ~15% of users | mild |
Headache | ~8% of users | mild |
Incidence rates sourced from published clinical trial data where available; otherwise based on community research observations.
Finding verified, high-purity Hexarelin requires rigorous COA verification. We independently evaluate vendors based on third-party HPLC testing, purity thresholds (≥98%), and batch-specific documentation.
View COA-Verified Hexarelin✓ Third-party tested·✓ US shipping·✓ COA on every batch
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PeptiDex. (2026). Hexarelin. PeptiDex Research Platform. https://peptidex.app/library/hexarelin
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