GHRP-6 Overview
Mechanism of Action
GHRP-6 is a synthetic hexapeptide acting as a potent ghrelin receptor (GHS-R1a) agonist. It stimulates robust growth hormone release from pituitary somatotrophs. Unlike selective GHRPs (Ipamorelin), GHRP-6 also significantly increases cortisol and prolactin and strongly stimulates appetite through the same ghrelin receptor pathway.
~15–60 minutes
Timing
Empty stomach — fast 2+ hours before and 30 min after
Injection Site
Subcutaneous, abdomen
Food
Carbs/fats blunt GH response. Fasting required.
Common Stacks
- CJC-1295 (no DAC) — GHRH + GHRP synergy
GHRP-6 Dosing Protocol
Standard Protocol
8–12 weeks100–300 mcg SQ 1–3x daily
On empty stomach. Expect significant appetite increase.
Nightly Protocol
8–12 weeks100 mcg SQ at bedtime
Single dose to amplify nocturnal GH surge.
GHRP-6 Expected Timeline
Week 1–2
Increased appetite; improved sleep
Week 3–4
Enhanced recovery; water retention
Week 6–8
Body composition changes
Week 8–12
Significant lean mass improvements
GHRP-6 Side Effects
Intense hunger (ghrelin activation)
Water retention
Cortisol elevation
Prolactin elevation
Tingling/numbness
GHRP-6 Research Studies
Growth hormone releasing peptide-6: a clinical review
Bowers CY — Growth Horm IGF Res (1998)
Foundational review by the discoverer of GHRPs, establishing GHRP-6's mechanism as a ghrelin receptor agonist with potent GH-releasing and appetite-stimulating properties.
PubMed: 10990140GHRP-6 FAQ
Why does GHRP-6 make you so hungry?
It activates the same ghrelin receptor as the hunger hormone. One of the strongest appetite stimulants among peptides. Ipamorelin is better if appetite stimulation is unwanted.
GHRP-6 or Ipamorelin?
Ipamorelin is more selective — releases GH without cortisol, prolactin, or hunger. GHRP-6 is stronger but with more side effects.