GHRP-6

Overview

GHRP-6 is a synthetic hexapeptide growth hormone secretagogue known for its strong GH-releasing effects and pronounced appetite stimulation. It was one of the first GHRPs developed and is widely used in research and performance contexts.

Mechanism of Action

GHRP-6 activates the ghrelin receptor (GHS-R1a) on pituitary cells, triggering robust growth hormone release. It strongly stimulates appetite via ghrelin pathway activation in the hypothalamus. It also increases cortisol and prolactin at higher doses, distinguishing it from more selective alternatives like ipamorelin.

Research Summary

Extensively studied since the 1980s, GHRP-6 was one of the first GH secretagogues characterized. Clinical trials confirm potent GH release and appetite stimulation. It has been studied for cardioprotection, wound healing, and age-related GH decline.

Dosing Information

Reported Side Effects

• Intense hunger (most common)
• Water retention
• Cortisol elevation
• Tingling in extremities
• Drowsiness
• Elevated prolactin levels

Research References

• Growth hormone releasing peptide (GHRP-6): stimulation of GH release in vivo and in vitro (1989)
• GHRP-6 cardioprotective effects: molecular mechanisms in ischemia-reperfusion injury (2012)
• Growth hormone secretagogues: history and clinical development (1999)