GHRP-2

GHRP-2 (Growth Hormone Releasing Peptide 2) is a synthetic hexapeptide that selectively binds the ghrelin/GHS-R1a receptor on the pituitary gland, stimulating release of growth hormone (GH). It is part of the GHRP family along with GHRP-6, hexarelin, and ipamorelin. GHRP-2 is one of the most potent GHRPs at GH release per microgram but, unlike ipamorelin, also causes a modest rise in prolactin and cortisol. It is sold strictly for laboratory research.

GHRP-2 is one of the original research peptides used to study growth hormone pulses. It acts on the ghrelin receptor (the same receptor that gets activated when you are hungry) to tell the pituitary to release a burst of GH. It is potent, fast-acting, and reliable in research. The downside compared to ipamorelin is that it also slightly raises cortisol and prolactin — which most forum users want to avoid — and is well known to increase appetite.

GHRP-2 binds the growth hormone secretagogue receptor (GHS-R1a) on pituitary somatotrophs, triggering calcium-mediated GH release. This signal is independent of and synergistic with GHRH, which is why GHRP-2 is often paired with a GHRH analog (CJC-1295, sermorelin, tesamorelin) in research to amplify the pulse.

• •GH-axis stimulation testing
• •Adult GH deficiency diagnostic research
• •Ghrelin and appetite regulation
• •Comparative GHRP pharmacology
• •Cortisol and prolactin off-target effects

GHRP-2 was once the default GHRP in research peptide stacks but has been largely replaced by ipamorelin for most users, because ipamorelin produces a cleaner GH pulse without raising cortisol or prolactin. GHRP-2 remains favored by users who specifically want appetite stimulation alongside GH release, or by those running diagnostic-style research protocols.

“Potent GH pulse, but bring an appetite.”

Almost always discussed in combination with a GHRH analog — most commonly CJC-1295 (with or without DAC). This is the classic 'GHRP + GHRH' synergy. Pairing with ipamorelin is uncommon because ipamorelin is functionally a cleaner replacement for GHRP-2.

GHRP-2 is a potent ghrelin-receptor-binding hexapeptide that stimulates pulsatile growth hormone release. It also raises appetite, cortisol, and prolactin modestly, which is why ipamorelin has largely replaced it in most modern research stacks. It is sold for laboratory research only.