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Hexarelin

Examorelin, HEX

A synthetic hexapeptide growth hormone secretagogue that stimulates GH release by acting on the ghrelin receptor in the pituitary and hypothalamus.

Quick Stats
Studies 233
Trials 61
Formula C47H58N12O6
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Utility 4
pubmed 1998

Does desensitization to hexarelin occur?

Rahim. A A; Shalet. S M SM

Hexarelin makes the body release a lot of growth hormone at first, but if you keep injecting it twice a day for weeks, the hormone boost gets smaller. In a 16‑week study with older adults, the boost fell by about half, but after stopping the drug for four weeks the hormone response bounced back to the original level. This means the body gets used to hexarelin, but the tolerance can be undone with a short break.

Utility 4
pubmed 1995

Metabolic modulation of the growth hormone-releasing activity of hexarelin in man.

Maccario. M M; Arvat. E E; Procopio. M M; Gianotti. L L; Grottoli. S S; Imbimbo. B P BP; Lenaerts. V...

Hexarelin is a synthetic peptide that triggers a strong growth hormone (GH) surge, and unlike the natural hormone-releasing factor (GHRH), its effect isn’t knocked down much by eating carbs or having high blood fats. In simple terms, you can still get a big GH boost from hexarelin even after a meal or when your blood is full of fatty acids.

Utility 4
pubmed Nov 1, 1997

Interaction of the growth hormone releasing peptide hexarelin with somatostatin.

Massoud. A F AF; Hindmarsh. P C PC; Brook. C G CG

Hexarelin can still trigger a big growth‑hormone (GH) surge even when the body’s natural GH‑blocking hormone, somatostatin, is high, especially if you pair it with a GHRH peptide. Removing somatostatin (like during a fast) makes hexarelin work even better on its own, and somatostatin doesn’t change hexarelin’s impact on prolactin or cortisol.

Utility 4
pubmed 1999

Effects of recombinant human insulin-like growth factor I administration on growth hormone (GH) secretion, both spontaneous and stimulated by GH-releasing hormone or hexarelin, a peptidyl GH secretagogue, in humans.

Ghigo. E E; Gianotti. L L; Arvat. E E; Ramunni. J J; Valetto. M R MR; Broglio. F F; Rolla. M M; Cava...

Giving a small dose of IGF‑1 raises IGF‑1 levels but doesn’t change the body’s natural GH pulses. However, it cuts the GH boost you get from hexarelin (a GH‑releasing peptide) by about 60%, and it also dampens the response to GHRH, though less strongly. In short, high IGF‑1 makes hexarelin less effective at raising GH.

Utility 4
pubmed Nov 1, 1995

Intranasal administration of the GHRP hexarelin accelerates growth in short children.

Laron. Z Z; Frenkel. J J; Deghenghi. R R; Anin. S S; Klinger. B B; Silbergeld. A A

A tiny peptide called hexarelin, when sprayed into the nose three times a day at about 60 µg per kilogram of body weight, raised IGF‑1 levels and sped up linear growth in short kids without obvious side‑effects, showing it can act like a growth‑hormone releaser when taken nasally.

Utility 4
pubmed 2000

Comparisons among old and new provocative tests of GH secretion in 178 normal adults.

Aimaretti. G G; Baffoni. C C; DiVito. L L; Bellone. S S; Grottoli. S S; Maccario. M M; Arvat. E E; C...

The study shows that hexarelin (a synthetic peptide) is a powerful trigger for growth hormone release, giving a strong GH spike comparable to other classic tests and close to the best combos, especially when paired with GHRH. This means hexarelin can be used as an effective, more convenient way to boost GH without the risks of insulin‑induced hypoglycemia.

Utility 4
pubmed 1996

Hexarelin-induced growth hormone, cortisol, and prolactin release: a dose-response study.

Massoud. A F AF; Hindmarsh. P C PC; Brook. C G CG

Hexarelin, when given by IV, boosts growth hormone (GH) in a dose‑dependent way, with a plateau around 1 µg/kg. It also raises prolactin (PRL) and cortisol, but cortisol only spikes at mid‑range doses. Adding a tiny amount of hexarelin (0.125 µg/kg) to a standard dose of GHRH dramatically amplifies GH release while keeping PRL modest and not increasing cortisol, suggesting a synergistic, more efficient protocol.

Utility 4
pubmed Nov 1, 1995

Hexarelin induced growth hormone release is influenced by exogenous growth hormone.

Massoud. A F AF; Hindmarsh. P C PC; Brook. C G CG

Hexarelin is a strong trigger for the body to release growth hormone, even more so than the natural hormone GHRH. Giving a dose of synthetic GH first does dampen the response, but hexarelin still works, just a bit less. This means you can use hexarelin to boost GH, but timing matters—don’t stack it right after a GH shot.

Utility 4
pubmed 1997

The growth hormone response to hexarelin in children: reproducibility and effect of sex steroids.

Loche. S S; Colao. A A; Cappa. M M; Bellone. J J; Aimaretti. G G; Farello. G G; Faedda. A A; Lombard...

Hexarelin reliably triggers a growth hormone surge, and the effect is stronger if you first boost estrogen levels (or testosterone, which converts to estrogen). The response is fairly consistent from one test to the next, but an anabolic steroid like oxandrolone doesn’t help. This means you can expect a predictable GH boost from hexarelin, especially when combined with estrogenic priming.

Utility 4
pubmed 1997

Mechanisms underlying the negative growth hormone (GH) autofeedback on the GH-releasing effect of hexarelin in man.

Arvat. E E; Di Vito. L L; Gianotti. L L; Ramunni. J J; Boghen. M F MF; Deghenghi. R R; Camanni. F F;...

Hexarelin is a short peptide that makes the body release a lot of growth hormone, even more than the usual hormone‑releasing factor. It works best when taken together with a GHRH peptide, giving a boost that’s bigger than the sum of each alone. However, if you’ve already taken a dose of growth hormone, hexarelin’s effect drops about a third, and GHRH’s effect almost disappears.

Utility 4
pubmed 1996

Short-term administration of intranasal or oral Hexarelin, a synthetic hexapeptide, does not desensitize the growth hormone responsiveness in human aging.

Ghigo. E E; Arvat. E E; Gianotti. L L; Grottoli. S S; Rizzi. G G; Ceda. G P GP; Boghen. M F MF; Degh...

In older adults, taking the peptide hexarelin by nose or mouth a few times a day for about two weeks didn’t blunt the body’s growth‑hormone response and gave a small rise in IGF‑1 and its binding protein, with no side‑effects reported.

Utility 4
pubmed Nov 1, 1997

Age-related growth hormone-releasing activity of growth hormone secretagogues in humans.

Arvat. E E; Camanni. F F; Ghigo. E E

Hexarelin (a growth‑hormone‑releasing peptide) reliably spikes growth hormone in humans, especially when you’re younger. Its effect drops in older adults because their natural GHRH is low and somatostatin (a brake) is high, but you can boost the response by pairing it with a GHRH‑like drug and taking it on an empty stomach. The peptide works even when free fatty acids are present, but strong somatostatin signals can blunt it.

Utility 4
pubmed 1995

GH responsiveness to repeated GHRH or hexarelin administration in normal adults.

Sartorio. A A; Conti. A A; Ferrero. S S; Spada. A A; Faglia. G G

In healthy adults, a single IV dose of the peptide hexarelin triggers a much larger growth‑hormone (GH) spike than the same dose of the hormone‑releasing factor GHRH. When you give hexarelin a second time after two hours, the GH response drops, but it still stays higher than a second GHRH dose. So hexarelin works better and loses its effect more slowly than GHRH.

Utility 4
pubmed 1994

Growth hormone-releasing activity of hexarelin, a new synthetic hexapeptide, after intravenous, subcutaneous, intranasal, and oral administration in man.

Ghigo. E E; Arvat. E E; Gianotti. L L; Imbimbo. B P BP; Lenaerts. V V; Deghenghi. R R; Camanni. F F

Hexarelin is a synthetic six‑amino‑acid peptide that strongly stimulates growth hormone (GH) release in healthy people. It works best when given by injection (IV or sub‑cut), but also has measurable effects when taken as a nasal spray or even a pill, though the oral route is barely effective. Compared to the natural GH‑releasing hormone, hexarelin produces about twice as much GH at the same dose.

Utility 4
pubmed 1994

Growth hormone-releasing activity of hexarelin in humans. A dose-response study.

Imbimbo. B P BP; Mant. T T; Edwards. M M; Amin. D D; Dalton. N N; Boutignon. F F; Lenaerts. V V; W&#...

Hexarelin is a tiny peptide that makes the pituitary release a burst of growth hormone (GH) when given by IV. In healthy men, doses from 0.5 to 2 µg per kg caused a dose‑dependent rise in GH that peaked around 30 minutes and fell back to baseline within 4 hours. The half‑life of the peptide’s effect is roughly 55 minutes, and the dose that gives half the maximal GH response (ED50) is about 0.5‑0.6 µg/kg.

Utility 3
pubmed Sep 1, 2014

The cardiovascular action of hexarelin.

Mao. Yuanjie Y; Tokudome. Takeshi T; Kishimoto. Ichiro I

Hexarelin is a lab-made peptide that works like the natural hormone ghrelin but is more stable and stronger. It can act directly on the heart and blood vessels, not just by boosting growth hormone, and may protect the heart through a special receptor called CD36. Researchers think it could become a drug for heart problems, but the evidence is still mostly from early studies and reviews.