Cella. S G SG; Cerri. C G CG; Daniel. S S; Sibilia. V V; Rigamonti. A A; Cattaneo. L L; Deghenghi. R...
In a small study of old beagle dogs, daily injections of hexarelin (500 µg per kg) for 16 weeks repeatedly boosted growth‑hormone spikes but didn’t raise IGF‑1 levels. The peptide also lowered a urine marker of bone breakdown and, in half the dogs, showed modest improvements in muscle tissue, while young untreated dogs showed no changes. These results hint that hexarelin can revive GH activity and may help muscle and bone health in aging, but the evidence is limited to dogs and may not translate directly to people.
Heavy drinking can mimic Cushing's syndrome by raising cortisol levels, but stopping alcohol usually brings things back to normal. The hexarelin test was one of the few ways researchers could tell the difference between true Cushing's and alcohol‑induced pseudo‑Cushing, while most other hormone tests couldn't. This isn’t a treatment study, just a diagnostic insight.
Hexarelin can boost growth hormone levels in kids about as well as a combo of GHRH and pyridostigmine, and better than arginine with estrogen, but it isn’t any more accurate for diagnosing growth problems and it needs an IV dose, which isn’t practical for most people.
Foppiani. L L; Giusti. M M; Sessarego. P P; Guido. R R
In a small study, the synthetic peptide hexarelin raised growth hormone (GH) levels in both women with high prolactin and healthy controls, but it also caused a slight increase in prolactin. The dopamine‑activating drug bromocriptine lowered prolactin and boosted GH, and when given before hexarelin it stopped the prolactin rise in the high‑prolactin group and only reduced it in controls. This shows hexarelin can act as a modest GH secretagogue, but its prolactin‑raising side effect may need to be managed.
Frenkel. J J; Silbergeld. A A; Deghenghi. R R; Laron. Z Z
A tiny 7‑day study gave kids with normal growth hormone a spray of the peptide hexarelin inside the nose. After a week their blood levels of IGF‑1 (a growth‑related hormone) and alkaline phosphatase went up, and their thyroid‑stimulating hormone rose a little but stayed in the normal range.
Isgaard. J J; Tivesten. A A; Friberg. P P; Bengtsson. B A BA
The paper explains that growth hormone (GH) and its partner IGF‑I help the heart grow and work better. Hexarelin, a compound that makes the body release more GH, was shown in animal studies to improve heart function after a heart attack, possibly by boosting GH or acting directly on heart receptors. However, the research is still early and done in experimental models, not humans.
Desaphy. J F JF; De Luca. A A; Pierno. S S; Imbrici. P P; Camerino. D C DC
In older rats, giving the peptide hexarelin (or growth hormone) for a few weeks helped the muscle's sodium channels work faster, which improved the ability of fast‑twitch muscle fibers to fire. However, the channels stayed smaller and more numerous, and the study was done only in rats, not people.
Cocchi. D D; Maccarinelli. G G; Sibilia. V V; Tulipano. G G; Torsello. A A; Pazzaglia. U E UE; Giust...
The study shows that hexarelin (a GH‑releasing peptide) and the natural hormone ghrelin can make bone‑forming cells from fetal rat skulls grow and produce bone‑building proteins, but adult bone cells from rats and most human samples don’t have the active receptor needed for this effect.
Bozzola. M M; Thome. A N AN; Giraldi. E E; Lhiaubet. A M AM; Schimpff. R M RM
The study found that kids with growth delay have higher blood levels of neurotensin (NT) than adults, and that NT levels dip when growth hormone (GH) spikes after a stimulation test, then rise again as GH falls. This suggests NT might act as a peripheral signal that helps control GH release, possibly by affecting somatostatin.
Broglio. F F; Fubini. A A; Morello. M M; Arvat. E E; Aimaretti. G G; Gianotti. L L; Boghen. M F MF;...
In patients with severe dilated cardiomyopathy, baseline IGF‑I levels are lower than in healthy people, but giving a short course of low‑dose growth hormone raises IGF‑I to normal levels. The peptide hexarelin triggers a strong GH release in these patients, similar to healthy controls, even though their response to the natural hormone‑releasing factor GHRH is blunted. Overall, the GH/IGF‑I system still works, but some parts are less responsive in heart‑failure patients.
Hatzimouratidis. Konstantinos K; Hatzichristou. Dimitrios G DG
The article reviews current and upcoming erectile dysfunction (ED) treatments, noting that most patients now use PDE5 inhibitors like Viagra. It mentions several new drug classes under development, including hexarelin analogues, but provides no specific data on how well they work or how to use them.
Pobee. Elizabeth E; Daziani. Gloria G; Gameli. Prince S PS; Basile. Giuseppe G; Carlier. Jeremy J; T...
The study shows that after taking alexamorelin, the body quickly breaks it down in the liver, turning most of it into a different peptide called hexarelin. This conversion makes it hard to detect alexamorelin use because hexarelin is also sold as its own product, so finding hexarelin in a test doesn't prove someone took alexamorelin.
McGirr. Rebecca R; McFarland. Mark S MS; McTavish. Jillian J; Luyt. Leonard G LG; Dhanvantari. Savit...
Scientists created a glowing version of the hormone ghrelin that sticks to the same receptor that hexarelin targets. It works just as well as natural ghrelin for binding and can be seen inside cells, especially in heart tissue. However, this is a research tool for imaging, not a new supplement or therapy.
Succu. Salvatora S; Mascia. Maria Stefania MS; Melis. Tiziana T; Sanna. Fabrizio F; Melis. Maria Ros...
In rats, injecting specific short pieces of the VGF protein into a brain region that controls sexual function makes them get erections. This works because the peptides boost nitric‑oxide production there, and blocking nitric‑oxide or oxytocin signals stops the effect. The findings are limited to direct brain injections in animals, not something you can do at home.
Bresciani. E E; Rapetti. D D; Donà. F F; Bulgarelli. I I; Tamiazzo. L L; Locatelli. V V; Torsel...
In young adult male rats, a gut‑derived peptide called obestatin cuts down food intake after a short fast, but it doesn't change growth‑hormone (GH) or stress‑hormone (corticosterone) levels, and it doesn't block the GH‑boosting action of another peptide, hexarelin.
Melis. M R MR; Succu. S S; Spano. M S MS; Torsello. A A; Locatelli. V V; Muller. E E EE; Deghenghi....
In rats, certain hexarelin‑like peptides (called EP peptides) cause a penile erection when they’re directly injected into a specific brain area, and this effect is linked to a rise in nitric oxide levels. Regular hexarelin didn’t work, and blocking nitric‑oxide production stopped the erection, showing the importance of that pathway.
Bellone. J J; Bellone. S S; Aimaretti. G G; Valetto. M R MR; Baffoni. C C; Corneli. G G; Origlia. C...
In kids with normal short stature, giving growth hormone (GH) reduces the body's ability to release more GH when later stimulated with either a GH‑releasing hormone (GHRH) or a GH‑secretagogue called hexarelin. However, giving GHRH first does not blunt the next GH surge. This shows that a natural feedback loop (likely via somatostatin) already works in childhood, but the exact reason why GHRH doesn't shut itself down is still unknown.
Melis. M R MR; Succu. S S; Spano. M S MS; Locatelli. V V; Torsello. A A; Muller. E E EE; Deghenghi....
In rats, two hexarelin-like peptides (EP 60761 and EP 50885) caused spontaneous erections when they were injected directly into a brain region that controls sexual function. The effect depended on dose, was blocked by drugs that stop oxytocin signaling or nitric‑oxide production, and did not involve dopamine or NMDA pathways. However, the way the peptides were given (direct brain injection) makes the findings far from something you could try at home.
Arnaldi. G G; Mancini. T T; Kola. B B; Appolloni. G G; Freddi. S S; Concettoni. C C; Bearzi. I I; Ma...
A 56‑year‑old woman with a rare lung carcinoid tumor that secreted ACTH also had the hormone‑producing machinery for ghrelin and its receptors. When given hexarelin (a ghrelin‑like peptide), her tumor released even more ACTH, showing that hexarelin can directly stimulate ACTH production in certain abnormal cells.
Melis. M R MR; Succu. S S; Spano. M S MS; Deghenghi. R R; Argiolas. A A
In rats, a hexarelin‑related peptide called EP 91073 can block erections caused by two other EP peptides when injected into a brain area that controls sexual function, but it doesn't stop erections triggered by dopamine, oxytocin, or NMDA. This suggests EP 91073 works as an antagonist at a specific receptor linked to those EP peptides and reduces related nitric‑oxide signals.