GHRP-6
Growth Hormone Releasing Peptide-6
What is GHRP-6?
GHRP-6 is the first-generation GHRP from which GHRP-2, Ipamorelin, and Hexarelin were derived. While largely superseded by more selective peptides, GHRP-6 retains use for appetite stimulation and is the most cost-effective GHRP for research purposes.
GHRP-6 activates GHS-R1a to stimulate GH release and has the strongest appetite-stimulating effect of any GHRP through ghrelin pathway activation — making it useful where caloric intake needs to be increased. Like GHRP-2, it produces moderate cortisol and prolactin elevation.
Research Evidence
Well-established GH release in multiple clinical trials with a strong dose-response relationship. The original clinical benchmark GHRP.
Strongest appetite effect of any GHRP. Clinically studied for cachexia and appetite disorders. Useful in lean mass protocols where caloric surplus is the goal.
Animal studies show cardioprotective effects similar to Hexarelin. Limited human data.
Evidence grades: Gold = RCT human data · Silver = multiple animal studies, consistent · Bronze = limited or preliminary
Dosing Protocols
Reconstitution Guide
| Vial Size | BAC Water | Concentration | Target draw |
|---|---|---|---|
| 2 mg | 2 ml | 1 mg/ml | 100mcg = 10 units |
| 5 mg | 5 ml | 1 mg/ml | 100mcg = 10 units |
Frequently Asked Questions
Why is GHRP-6 less popular than Ipamorelin?
GHRP-6 established the proof of concept. Ipamorelin was later developed to be highly selective — producing GH pulses without cortisol, prolactin, and appetite elevation. Ipamorelin's cleaner profile makes it preferable for most GH optimization goals. GHRP-6 remains useful when appetite stimulation is specifically desired.
Does GHRP-6 cause weight gain?
GHRP-6 stimulates appetite strongly through the ghrelin pathway. Combined with GH-driven muscle anabolism, it can contribute to weight gain in lean mass protocols. For fat loss protocols, Ipamorelin or GHRP-2 are preferred.
References
- [1]Bowers CY, Momany F, Reynolds GA, Hong A. On the in vitro and in vivo activity of a new synthetic hexapeptide that acts on the pituitary to specifically release growth hormone. Endocrinology. 1984;114(5):1537-1545.
- [2]Sigalos JT, Pastuszak AW. The safety and efficacy of growth hormone secretagogues. Sex Med Rev. 2018;6(1):45-53.
This profile was prepared using AI-assisted research synthesis. Citations are provided where applicable — verify with primary sources before clinical application.
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