Hexarelin vs Ipamorelin | GHRP Potency vs Selectivity Comparison | QSC Research
Hexarelin vs Ipamorelin — Potency vs Selectivity GHRP Comparison
Hexarelin and ipamorelin are both GHRPs acting on GHSR1a — but hexarelin is the most potent GHRP and activates CD36 (cardiac/macrophage receptor) independently of GH release. Ipamorelin is the most selective GHRP (GH only, no cortisol/prolactin). This comparison helps researchers choose between maximum potency and maximum selectivity.
Side-by-Side Comparison
Property
Hexarelin
Ipamorelin
CAS
140703-51-1
170851-70-4
GH release potency
Highest of all GHRPs — maximum GHSR1a agonism
Moderate — selective GHSR1a
Cortisol increase
Significant — higher than GHRP-2/6
Minimal — <10% above baseline
Prolactin increase
Significant
Minimal
CD36 activation
Yes — cardiac receptor, cardioprotection independent of GH
No
Cardiac research
Primary tool for GHS-R independent cardioprotection
Not used for cardiac
GH selectivity
Low — multi-target including cortisol and CD36
High — GH-specific
Research advantage
Maximum GH, cardiac/cardioprotection, strong GHSR1a agonist
Clean GH release, no confounds, GH-only studies
Standard combination
Less commonly combined — often used solo
Standard: CJC-1295 No-DAC + Ipamorelin
QSC purity
≥99% HPLC — Janoshik COA
≥99% HPLC — Janoshik COA
Hexarelin CD36 — the non-GH cardiac research application
Hexarelin activates CD36 (scavenger receptor B2) on cardiomyocytes and macrophages independently of GHSR1a and GH release. This makes hexarelin uniquely useful for cardioprotection research — it can be studied with GH receptor knockout models or GH receptor antagonists to isolate the CD36-mediated cardiac effects from GH-mediated anabolic effects. No other GHRP has this property.
When maximum GH release is the research priority
For researchers who need the highest achievable GH pulse from a single GHRP, hexarelin is the compound of choice. This is relevant for: studying maximum GH receptor saturation, comparing GHRP potency ceiling effects, or in aged/hypogonadal models where pituitary GH responsiveness is reduced and maximum stimulation is needed to see detectable GH release.
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Frequently Asked Questions
What makes hexarelin the most potent GHRP?
Hexarelin (His-D-2-methyl-Trp-Ala-Trp-D-Phe-Lys-NH2) has structural features that produce the highest GHSR1a binding affinity and receptor activation of any synthetic GHRP. It also activates CD36 independently — a unique property not shared by other GHRPs.
What is CD36 and why does hexarelin activate it?
CD36 (scavenger receptor B2) is expressed on cardiomyocytes, macrophages, and endothelial cells. Hexarelin activates CD36 independently of GHSR1a — producing cardioprotective effects (reduced ischaemia-reperfusion injury, improved cardiac function) that are not GH-dependent. This is the primary rationale for using hexarelin in cardiac research.
Is ipamorelin better than hexarelin for general GH research?
For GH-focused research where cortisol, prolactin, and CD36 effects are confounds: yes, ipamorelin is preferred. For maximum GH pulse or cardiac research: hexarelin is preferred. The choice depends on whether selectivity or potency is more important for the experimental design.
