GHRP-6
unknown riskAlso: Growth Hormone Releasing Peptide-6 · His-DTrp-Ala-Trp-DPhe-Lys-NH2
GHRP-6 is a synthetic hexapeptide GH secretagogue notable for strong appetite stimulation via ghrelin pathway activation. It was one of the first characterized GHRPs and remains used in cachexia and wasting research.
Reported Benefits
GH Release
Reliable GH secretion demonstrated in human studies.
Appetite Stimulation
Pronounced hunger increase — useful for cachexia, problematic for weight management.
Cardioprotection
Similar CD36-mediated cardiac effects as hexarelin in animal models.
Mechanism of Action
GHRP-6 binds GHSR-1a ghrelin receptors, triggering GH release and appetite stimulation simultaneously. The appetite effect is more pronounced than GHRP-2 or ipamorelin. Also has some cortisol/prolactin-stimulating activity.
Key Clinical Studies
Bowers CY (1993)
pharmacodynamic · Healthy adults
GH release with significant appetite stimulation effect
Overview
GHRP-6 is the original growth hormone releasing peptide, discovered before GHRP-2 and ipamorelin. Its strong appetite-stimulating effect — a direct result of ghrelin receptor activation — makes it particularly relevant for cachexia and muscle-wasting conditions where both GH secretion and appetite increase are desired.
Appetite as Feature and Bug
The pronounced appetite stimulation that limits GHRP-6 utility in weight management protocols becomes therapeutically relevant in cancer cachexia, HIV wasting syndrome, and post-surgical recovery where improving nutritional intake is a priority. This characteristic differentiates its clinical niche from ipamorelin.
Historical Significance
GHRP-6 was instrumental in characterizing the ghrelin receptor system before ghrelin itself was discovered. The discovery that a synthetic peptide could activate what was later identified as the ghrelin receptor opened an entire field of metabolic and appetite research.
Current Use Context
In clinical anti-aging practice, GHRP-6 has largely been supplanted by ipamorelin due to ipamorelin’s cleaner cortisol/prolactin profile. GHRP-6 retains relevance in research contexts and in specific clinical scenarios where appetite stimulation is desired.
Regulatory Status
Research OnlyNot FDA-approved; research-only status
Safety Profile
Side Effects
- •Significant appetite increase
- •Water retention
- •Cortisol elevation
- •Prolactin elevation
Contraindications
- •Active malignancy
- •Diabetes
- •Obesity
Drug Interactions
- •Insulin
- •Glucocorticoids
Primary Uses
Related Peptides
Weekly Briefing
Regulatory updates + new study breakdowns.
For Practitioners
Do you prescribe GHRP-6?
Get in front of patients who've already researched this protocol and are ready to consult. Featured listings from $199/mo.
Get Listed →