Growth hormone axis
Hexarelin
Examorelin · 6-aa · GHS
The most potent of the GHRP family — a strong, well-documented GH pulse, but also the most consistent reports of cortisol/prolactin spiking and rapid tolerance.
Reference status
Editorial research · independent review pending · 3 claims graded
What it is
Hexarelin produces one of the largest GH pulses of any secretagogue peptide, and has genuine human pharmacology studies behind that specific effect, including some interest in cardioprotective mechanisms in animal research.
It's also the GHRP most consistently associated with side effects like elevated cortisol and prolactin, and with desensitisation (reduced effect) after continued use — points the community itself raises more than for milder options like Ipamorelin.
The science, graded
What’s claimed — and how strong the evidence behind each claim actually is.
“Produces a very strong GH pulse”
Genuinely one of the better-documented effects in the GHRP class, from real human pharmacology studies.
Claim-level citation mapping is in progress.
“May support heart-muscle protection”
An interesting animal-research finding; not established as a human benefit.
Claim-level citation mapping is in progress.
“Free of the cortisol/prolactin issues seen with other GHRPs”
The opposite is closer to the documented pattern — this is the GHRP most linked to those side effects.
Claim-level citation mapping is in progress.
Legal and regulatory context
Separate summaries for Great Britain, the United States, and the European Union. These are preliminary research summaries awaiting independent regional review; they are not legal determinations or advice.
Great Britain
Not a licensed medicine in the UK; sold as a research chemical only, with no legal human-use supplement route.
This is preliminary regulatory research, not a reviewed legal determination or legal advice.
United States
Regional legal and regulatory review required before publication.
This is preliminary regulatory research, not a reviewed legal determination or legal advice.
- FDA's Concerns About Unapproved Drugs · U.S. Food and Drug Administration
European Union
Regional legal and regulatory review required before publication.
This is preliminary regulatory research, not a reviewed legal determination or legal advice.
- Buying medicines online · European Medicines Agency
What the community says
Respected for potency but widely flagged as the 'advanced, use with caution' GHRP. Experienced users specifically warn newcomers away from starting here.
Where they’re talking
- r/PeptidesFrequently described as 'not a beginner peptide'.
- Bodybuilding forumsCortisol/prolactin side-effect reports are a recurring theme.
References
- 1.Supply unlicensed medicinal products (specials) · MHRA
- 2.FDA's Concerns About Unapproved Drugs · U.S. Food and Drug Administration
- 3.Buying medicines online · European Medicines Agency