GHRP-6
Growth Hormone Releasing Peptide-6
The original GH secretagogue - potent but hungry
GHRP-6 was one of the first synthetic GH secretagogues. It produces significant GH release but is known for dramatically increasing appetite.
Admin routes
Subcutaneous
Popularity
Medium
Side effects
Generally mild
AU vendors
0 rated
✓Key benefits
📈What to expect
Intense hunger within 20 minutes of injection
Improved sleep; increased appetite and caloric intake
Muscle fullness; improved recovery from training
Body composition changes; cycle or switch to ipamorelin
Based on community reports and published research. Individual results vary significantly.
💊Dosing protocols
GH stimulation
100–200 mcg
Two or three times daily
8–12 weeks
Appetite stimulation
100 mcg
30 minutes before meals
4–8 weeks
Dosing information is sourced from published research and community protocols. This is not a recommendation. Consult a healthcare professional.
Research status|Extensive preclinical and clinical data - well-characterised
Overview
GHRP-6 (Growth Hormone Releasing Peptide-6) is a synthetic hexapeptide and one of the earliest GH secretagogues developed. It stimulates GH release by binding to ghrelin receptors on the pituitary. While effective at boosting GH, it is known for its strong appetite-stimulating effects - making it useful for underweight individuals or those wanting to increase caloric intake, but problematic for those seeking GH benefits without hunger.
⚙️How it works
Binds to GHS-R1a (ghrelin) receptors on pituitary somatotrophs, triggering GH release. Also strongly activates ghrelin's orexigenic (appetite-stimulating) pathway, which is why it causes intense hunger within 20 minutes of administration. Additionally raises cortisol and prolactin levels more than ipamorelin.
⚡Side effects
📅Research history
First synthetic GHRP developed by Bowers - transforms GH research
Extensively studied in clinical trials; ghrelin receptor characterised
Widely adopted in bodybuilding and anti-aging
Largely superseded by ipamorelin for clinical use
Still used for appetite stimulation and as a cost-effective option
GHRP-6 vs newer secretagogues
GHRP-6 was a major advance in the 1990s but has been largely superseded by ipamorelin and CJC-1295 combinations. Its main drawbacks - intense hunger, cortisol elevation, and prolactin increase - are absent or minimal with ipamorelin. The one niche where GHRP-6 remains useful is for individuals who actually want appetite stimulation (e.g., recovering from illness, difficulty gaining weight).
References
- [1]Bowers CY, et al. '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.
- [2]Smith RG, et al. 'A non-peptidyl growth hormone secretagogue.' Science, 1993.
Frequently asked questions
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Community experiences
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Open CalculatorDisclaimer: This guide is for educational and informational purposes only. It is not medical advice. The dosing protocols listed are sourced from published research and community reports and do not constitute a recommendation. Always consult a qualified healthcare professional before using any peptide. Australian regulations classify many peptides as Schedule 4 (prescription-only) substances. Check current TGA guidelines before purchasing.