Εξαρελίνη Οξικός (Examorelin)

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Mechanism of Action — Dual GHSR-1a + CD36 Pharmacology

Hexarelin is unique among the GHRP family in having well-documented activity at two mechanistically distinct receptors:

• GHSR-1a agonism (primary GH-releasing mechanism) — Hexarelin binds the ghrelin receptor (GHSR-1a, a Gq-coupled GPCR) on pituitary somatotrophs with sub-nanomolar affinity. Receptor activation drives PLC → IP₃ → Ca²⁺ release, triggering GH secretory granule exocytosis. The D-2-Me-Trp at position 2 and D-Phe at position 5 confer high resistance to proteolytic degradation, extending the plasma half-life vs natural ghrelin.
• CD36 binding (secondary cardioprotective mechanism) — Hexarelin (unlike Ipamorelin or GHRP-6 to the same degree) binds CD36 — a scavenger receptor on cardiomyocytes, vascular endothelium, and macrophages. Published research (Bodart et al. 2002, others) has demonstrated direct cardioprotective effects in ischaemia-reperfusion injury models that are independent of growth hormone — the CD36-binding mechanism preserves cardiac contractility, reduces post-ischaemic ventricular dysfunction, and modulates macrophage activation.
• GH-axis downstream consequences — Like all GHRPs, Hexarelin’s GH-releasing activity drives downstream IGF-1 production, increased lipolysis, increased lean mass, and improved nitrogen balance in published in-vivo work. Effects largely mirror the broader GH-axis pharmacology.
• Tachyphylaxis with chronic dosing — Sustained high-dose Hexarelin produces GHSR-1a desensitization (tachyphylaxis), reducing GH-releasing potency over 4–6 weeks of continuous administration. Published research uses pulsed dosing protocols to mitigate this.
• Cortisol and prolactin elevation — At higher doses Hexarelin elevates serum cortisol and prolactin alongside GH (mirroring GHRP-2 and GHRP-6 in this respect). For research protocols where clean GH-only release is needed, Ιπαμορελίνη is the preferred selective alternative.

Published Research Applications

• GHRP / GH-secretagogue pharmacology — most potent GHRP reference compound on a per-mg basis
• GHSR-1a receptor pharmacology — canonical research tool alongside ghrelin and ipamorelin
• Cardioprotection research (CD36-dependent) — unique among the GHRP family for documented direct cardiac effects in ischaemia-reperfusion models
• Growth-hormone axis research — drives strong endogenous GH pulse without injecting exogenous hGH
• Body-composition research — used in published rodent work alongside GHRH analogues for lean-mass / fat-mass dissection
• Tachyphylaxis and GHSR-1a desensitization research — well-documented tachyphylaxis profile makes it a useful tool for receptor-desensitization pharmacology

For broader context see Ιπαμορελίνη (clean GH-only secretagogue — no cortisol/prolactin), GHRP-2 Ακετάτη (sibling GHS), GHRP-6 Οξικός (Examorelin) (sibling GHS), CJC-1295 with DAC (GHRH analogue, commonly stacked), Σερμορελίνη (GHRH 1-29).

Available Strengths

How It Compares — Hexarelin vs Ipamorelin

Ιπαμορελίνη is the cleanest GH-only secretagogue in this family — strong GH release with no cortisol or prolactin elevation. Hexarelin is the most potent in the family on a per-mg basis but elevates cortisol and prolactin at higher doses. Hexarelin also has the unique CD36-binding cardioprotective mechanism. Researchers choose Hexarelin for maximum GH-releasing potency or for the CD36 axis specifically; Ipamorelin for clean isolated GH-axis research where avoiding cortisol / prolactin confounders matters.

Storage and Reconstitution

Store lyophilized vials at 2–8 °C; freeze unopened vials at −20 °C for long-term storage. Reconstitute with bacteriostatic water (1.0 mL per 2 mg vial → 2 mg/mL; 1.0 mL per 5 mg vial → 5 mg/mL). Swirl gently to dissolve. Store reconstituted vials at 2–8 °C, use within 30 days. Protect from light. Avoid repeated freeze-thaw cycles.

FAQ

How is Hexarelin different from GHRP-2 and GHRP-6?

All three are 6-amino-acid synthetic GH-releasing peptides in the same family. Hexarelin is the most potent per-mg, but also elevates cortisol/prolactin more than GHRP-2 and less than GHRP-6. Hexarelin uniquely binds CD36 for cardioprotective effects not seen with GHRP-2 or GHRP-6.

What is the typical research dose?

Rodent in-vivo protocols typically use 50–200 µg/kg SC, 1–3×/day. In-vitro pituitary culture protocols use nanomolar concentrations. Published human research has used 1–2 mg SC per dose.

What is the WADA status?

Hexarelin (Examorelin) is on the WADA Prohibited List under class S2 (Peptide Hormones, Growth Factors). Prohibited at all times in athletic contexts.

Can Hexarelin be combined with CJC-1295 or other GHRH analogues?

Yes — Hexarelin (GHS) + CJC-1295 (GHRH analogue) is the canonical “GHRP + GHRH” stacking protocol that produces synergistic GH release through engagement of two complementary pituitary pathways. Sermorelin and Tesamorelin are alternative GHRH partners.

Other Research Peptides for Growth-Hormone Axis Research

• Ιπαμορελίνη — Clean GH-only secretagogue — no cortisol/prolactin elevation
• GHRP-2 Ακετάτη — Sibling GHRP family member
• GHRP-6 Οξικός (Examorelin) — Sibling GHRP family member (also increases hunger)
• CJC-1295 with DAC — GHRH analogue — canonical stacking partner
• Σερμορελίνη — GHRH 1-29 analogue — alternative GHRH partner
• BAC Water (Bacteriostatic Water) — Required for reconstituting any lyophilized vial — sterile, 0.9% benzyl-alcohol-preserved diluent

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