GHRP-6 vs Hexarelin
Potency versus appetite. Hexarelin is among the strongest GH-releasing peptides ever put into people; GHRP-6 is the milder relative whose hallmark is hunger. Neither is selective.
GHRP-6
Pulses GH short-term, but its most reliable real-world effect is a surge in appetite; no long-term human outcomes and not approved.
Full GHRP-6 evidence reviewHexarelin
One of the most potent GH secretagogues studied — but it also raises cortisol and prolactin, desensitizes with repeated use, and is unapproved.
Full Hexarelin evidence reviewSide by side
| GHRP-6 | Hexarelin | |
|---|---|---|
| Marketed for | Muscle, recovery, 'anti-aging' | Muscle, recovery, 'anti-aging' |
| Evidence grade | Clinical data | Clinical data |
| Family | GH axis | GH axis |
| Regulatory status | Not FDA-approved | Not FDA-approved |
| How it's obtained | Research-only | Research-only |
| Key human source | Jaffe, JCEM 1993 | Maccario, Eur J Endocrinol 2002 |
marks a row where the two differ. Evidence grades come from our evidence matrix, which grades each molecule on the human data for the use it is marketed for.
Our verdict
Hexarelin has the stronger measured GH effect, releasing substantially more GH than GHRH in controlled human comparisons, but it is not selective; repeated daily subcutaneous dosing raised prolactin, ACTH and cortisol alongside GH, and the GH response shows tachyphylaxis, attenuating with continued use. GHRP-6 also raises ACTH and cortisol, blunts with sustained dosing, and its most consistent real-world effect is appetite. Neither is an approved drug, both are sold as research material of unverified dose and purity, and both are prohibited in sport. Neither has human outcome trials for muscle, fat loss or aging, and they have not been compared directly.
GHRP-6 fits if
GHRP-6 is the relevant molecule for understanding ghrelin-driven hunger and the older multi-route GH-stimulation literature.
Hexarelin fits if
Hexarelin is worth reading about for its CD36 cardiovascular biology, which runs independent of growth hormone, but that work is preclinical and does not make it a therapy.
Where to get it
Where to get peptide therapy
Clinician-led telehealth services that prescribe compounded peptides. The specific peptides offered vary by provider — confirm GHRP-6 availability before ordering.
