Hexarelin.
A synthetic six amino acid peptide that switches on the ghrelin receptor in the pituitary, prompting a pulse of your own growth hormone rather than supplying any.
Reviewed March 2026
- Category
- Peptide
What Hexarelin is, and what it does.
- Does it work
- This is an investigational peptide studied in short pharmacology work, not a supplement ingredient. It belongs in research settings and under medical supervision.
- How much to take
- The band on record is 100 to 200mcg a day, and 400mcg is a research condition rather than a daily target. Repeat dosing shrinks the pulse as the receptor desensitises.
- Time to feel it
- A growth hormone pulse follows within roughly fifteen to thirty minutes of a dose, read on a blood assay. Nobody has established a timeline for anything a person notices.
- The first dose
- A growth hormone pulse peaks within about half an hour on a blood assay, usually with hunger soon after the dose. Cortisol and prolactin move alongside it.
- With regular use
- Repeat dosing blunts the hormone pulse as the receptor desensitises, and cortisol and prolactin move alongside it. Human data past a few weeks has not been collected.
- How well tolerated
- It moves several hormone axes at once, including cortisol and prolactin, so it needs medical supervision. Anyone subject to anti-doping testing should check its status first.
- How it feels
- Reported experiences are hunger shortly after a dose and sometimes warmth or flushing. Beyond short pharmacology studies, the subjective experience has not been catalogued.
- The overlooked benefit
- It also binds CD36 in heart tissue and macrophages, a site the other secretagogues in its class do not share, so its pharmacology is not interchangeable with theirs.
100 to 200mcg a day is where Hexarelin works.
Source: Ghigo et al. J Endocrinol Invest 1997; research peptide literature
The proof, claim by claim.
These words describe the research, not the molecule's worth. Research strength is how much work stands behind one claim, and it is never a product score.
Hexarelin has emerging evidence. Based on 562+ studies.
- Growth hormone release from the pituitaryRandomised trial
- Adrenocorticotropic hormone, cortisol and prolactin releaseRandomised trial
- Reduced hormone response with repeated dosingRandomised trial
- Cardiac tissue signalling through CD36Animal study
- Appetite signalling through the ghrelin receptorAnimal study
Questions people ask about Hexarelin.
- When should I take it?
- Timing matters less than consistency. Pick a time that works for you and take it daily.
- Can I take it with other supplements?
- Usually fine. The main thing to watch is not doubling up on the same ingredient from different products. If you're on prescription meds, check with your pharmacist first.
- Any side effects to watch for?
- Most people tolerate it well at recommended doses. GI upset is the most common complaint with any supplement. Start with a lower dose and work up. If something feels off, stop and reassess.
- Who benefits most from this?
- Honestly, most people would benefit more from the basics. But if you've got a specific reason to try it, the risk is generally low.
Why these belong in the same formula. Each row says what the basis is, from settled biochemistry through to a trial that measured the pair.
Arginine lowers hypothalamic somatostatin tone, the brake on pituitary growth hormone release. A ghrelin-receptor secretagogue pushes the accelerator, so the two act on opposite sides of the same control loop and the pulse is larger than either produces alone.
Ornithine and arginine interconvert through the urea cycle, so ornithine feeds the same amino-acid signal that reduces somatostatin tone. The effect on a growth hormone pulse follows the arginine mechanism at a weaker level.
Oral glycine raises circulating growth hormone acutely by a route separate from the ghrelin receptor. Combined with a GHS-R1a agonist, the effect on the hormone measure is additive rather than mechanistically linked. Growth hormone concentration is a marker, and no combination has been measured.
Lysine has been studied with arginine as an oral amino acid combination reported to raise growth hormone, most plausibly by reducing somatostatin tone. That is a separate lever from receptor agonism. Effects reported at the level of hormone markers, with no data on the combination named here.
Oral GABA has been reported to raise immunoreactive growth hormone acutely, probably by a central hypothalamic route rather than at the pituitary receptor. Stacked with a secretagogue the effects on the marker would be expected to add. Whether a transient hormone rise means anything downstream is a separate question that these data do not answer.
Alpha-GPC is reported to raise growth hormone acutely through cholinergic suppression of somatostatin, which is upstream of and separate from ghrelin receptor agonism. Two levers on the same axis usually add. The readouts are short-window hormone markers, not outcomes.
The largest natural growth hormone pulse occurs in early slow-wave sleep, so anything that changes sleep architecture changes the baseline a secretagogue acts on. Melatonin is used on that reasoning. The interaction is timing-related and has not been measured for this pairing.
A rise in circulating free fatty acids blunts pituitary growth hormone release, which is the accepted reason a fatty meal reduces the response to a secretagogue. Taking a rapidly absorbed fat close to a dose therefore works against it. This is a well-described suppressive mechanism, not a synergy.
Any growth hormone or IGF-1 signal still needs amino acid substrate for tissue protein synthesis, which a dairy protein supplies. At the same time a meal alters the secretory response, so timing runs in two directions here. The relationship is mechanistic and unmeasured for this pairing.
Zinc is a structural and catalytic cofactor throughout growth and IGF-1 signalling, and low zinc status is associated with lower IGF-1 measures. That makes zinc status upstream context rather than a partner acting on the receptor. Association at the level of markers, not a demonstrated causal pairing.
A modest oral glutamine dose has been reported to raise circulating growth hormone acutely, by a route that does not involve the ghrelin receptor. Any combined effect on the marker would be additive. The size and the meaning of such a transient rise are both uncertain.
Oral citrulline is converted to arginine in the kidney and raises plasma arginine more reliably than oral arginine itself, and arginine is the amino acid long used to provoke a growth hormone response. That places citrulline upstream of the same somatostatin-related lever. Marker-level and untested in this combination.
Nothing specific on file for Hexarelin. Match the label to the daily amount above, and tell your doctor what you take.
Not medical advice. Show the label to your pharmacist.What Hexarelin actually does.
Hexarelin is a synthetic hexapeptide of the growth hormone secretagogue class, structurally unrelated to growth hormone itself. It acts as an agonist at GHS-R1a, the receptor whose endogenous ligand is ghrelin, so it prompts release of stored hormone rather than supplying any.
GHS-R1a activation on pituitary somatotrophs works through the Gq pathway, raising inositol trisphosphate and intracellular calcium, which triggers release of growth hormone granules as a pulse rather than as a steady output.
Somatostatin tone from the hypothalamus opposes that release, which is why the size of the response to a secretagogue depends on when in the natural rhythm it is given and on the prevailing somatostatin signal.
As a six-residue peptide it is cleaved by gastric acid, pepsin and brush-border peptidases, so oral exposure is a small fraction of parenteral exposure. The C-terminal amide and the D-amino acid substitutions in its sequence are there to slow, not stop, that degradation.
Getting Hexarelin from food.
The whole-food sources on file. A supplement closes the gap, it does not replace dinner.
A gram-for-gram figure (how much of each you would eat to match a dose) will appear here once it is sourced and reviewed. This page will not print a number it cannot cite.
The forms it comes in.
FDA Disclaimer: These statements have not been evaluated by the Food and Drug Administration. This information is for educational purposes only and is not intended to diagnose, treat, cure, or prevent any disease. Consult your healthcare provider before starting any supplement regimen.