
GHRP-6
Growth Hormone Releasing Peptide-6
Also called GHRP-6, growth hormone releasing peptide-6
The original GH releaser — and the hungriest
GHRP-6 is the one that makes you ravenous. It copies ghrelin, the hormone your stomach releases when it is empty, so it triggers growth hormone and a wave of genuine hunger at the same time. For people trying to eat more that is the feature. For everyone else it is the reason they switched to something else.
A first-generation hexapeptide ghrelin-receptor agonist that drives a strong growth hormone pulse and a pronounced surge in appetite. GHRP-6 is the most ghrelin-like of the GH secretagogues, which makes it a favorite for hard-gainers and recovery — but also the one most likely to raise cortisol and prolactin at higher doses.
- Half-life
- ~15–60 min
- Route
- Subcutaneous injection
- Typical dose
- 100–300 mcg 1–3x/day
- Availability
- Research-only
Studied in people, and well studied in animals
What people use GHRP-6 for
Reported uses, roughly in order of how often they are the reason someone goes looking. Whether it works for any of them is a separate question, answered under each one.
- Eating more
- Its real distinguishing use. The hunger is strong and arrives within twenty minutes, which is genuinely useful if you are trying to gain weight and struggle to eat enough.
- A growth hormone pulse
- Works, and works reliably, though not as strongly as hexarelin. Usually paired with a GHRH like CJC-1295 because the two act on different receptors and stack.
- Recovery and sleep
- The usual claims for this family, mostly downstream of the growth hormone pulse and reported rather than demonstrated.
Mechanism of Action
How GHRP-6 works
GHRP-6 mimics ghrelin to release growth hormone through the GHS-R1a pathway:
- Ghrelin receptor (GHS-R1a) activation — binds the growth hormone secretagogue receptor on pituitary somatotrophs, triggering a calcium-dependent GH pulse. As a true ghrelin mimetic it activates the receptor strongly but non-selectively.
- Marked appetite stimulation — the same ghrelin signaling that releases GH acts on the hypothalamic arcuate nucleus to sharply increase hunger, often within 20–30 minutes. This is GHRP-6's signature effect and distinguishes it from the cleaner Ipamorelin.
- Broader hormonal cascade — at higher doses it can mildly raise cortisol, ACTH and prolactin, unlike the highly selective Ipamorelin. Dose discipline keeps these off-target effects minimal.
- Cytoprotective signaling — GHS-R1a activation has documented gastric and cardiac cytoprotective effects in research models, independent of the GH axis.
GHRP-6 dosage calculator
Opens at 100 mcg, from the doses reported for GHRP-6. Change any box to match your own vial. It works out where to pull the plunger to.
How much is in the vial?
Printed on the label, in milligrams
How much water did you add?
Bacteriostatic water, in millilitres
What dose are you taking?
The dose you already intend to use
Which syringe?
Barrel size, printed on the wrapper
Draw to
2 units
on a 0.5 mL insulin syringe (0.02 mL)
- Strength once mixed
- 5 mg/mL
- Doses in the vial
- 100
10 mg in 2 mL makes 5 mg/mL. A 100 mcg dose is 0.02 mL of that, which is 2 units.
Want a rounder number? Adding 10 mL instead would put this dose at exactly 10 units, which is easier to draw accurately.
This is arithmetic, not advice. It converts a dose you already have into a mark on a syringe. It does not tell you what dose to take, and GHRP-6 is not prescribed by us. Dosing belongs with a qualified clinician.
GHRP-6 side effects: what people reported
The hunger is not a side effect people can ignore. It is the defining experience of this compound and the main reason people abandon it.
What most people notice
- Intense hunger within about twenty minutes, strong enough to derail a diet
- A head rush or flushing on injecting
- Tiredness
- Water retention
- Injection-site redness
Worth keeping an eye on
- Raised cortisol and prolactin, less than hexarelin but more than ipamorelin
- Tingling hands from fluid retention
- The hunger makes it a poor fit for anyone cutting, which is the single most common mismatch between what people want and what this does
Dose matters. Hunger, cortisol and prolactin all rise with dose, which is why more is rarely better here.
Source: Reported use and the pharmacology of ghrelin mimetics. This is a summary of published findings, not a complete safety profile and not medical advice. GHRP-6 should only be considered with a qualified clinician who knows your history.
Your Genetics & GHRP-6
The genes involved in how GHRP-6 works
GHRP-6 works through the receptors these genes build, and the genes vary from person to person. Researchers have linked some of that variation to differences in how people respond. A DNA report tells you which versions you carry.
GHSR · ••
Variants in the growth hormone secretagogue receptor gene change receptor density and signaling efficiency. Lower GHSR expression means fewer targets for GHRP-6, blunting both the GH pulse and the appetite response.
GHRL · ••
The Leu72Met variant alters ghrelin processing and circulating levels and is linked to differences in appetite and GH secretion. Since GHRP-6 acts on the same receptor as your own ghrelin, this variant shapes how strong the hunger surge feels.
GHR · ••
The GHR exon 3 deletion (d3-GHR) increases downstream GH sensitivity. d3 carriers convert each GHRP-6 GH pulse into greater IGF-1 output, often reaching the same result at a lower dose.
Somatostatin is the brake on GH release. Variants that raise somatostatin tone can partially blunt the GHRP-6 pulse, making timing (dosing when somatostatin is naturally lower, such as the evening) more important.
The dots after each gene are where your own result goes. Your report fills them in with the two letters you carry at that position.
Which variants do you carry?
Upload your DNA data, or get tested through our partner, to find out.
Commonly combined with
What GHRP-6 is most often paired with, and why:

CJC-1295
GH Synergy StackModerate EvidenceCJC-1295 (Modified GRF 1-29)
A copy of the brain signal that tells the pituitary to release growth hormone, rewritten so the enzyme that normally destroys it in minutes cannot. Before you read any dose, check which version you have: with DAC it keeps growth hormone up for days, without DAC it produces a short pulse, and nearly every blend sold with ipamorelin contains the second one.
4
Gene variants
30+
Studies

Ipamorelin
cleaner GH pulse alternativeModerate EvidenceIpamorelin Acetate
Presses the same switch your stomach uses to say it is empty, the one that also triggers a growth hormone release, but largely without the hunger. Its selling point is what it does not do: older peptides in its family also pushed up cortisol and prolactin, and this one mostly stops at growth hormone. It is almost always sold blended with CJC-1295.
4
Gene variants
40+
Studies

BPC-157
Injury Recovery StackModerate EvidenceBody Protection Compound 157
BPC-157 is the peptide people reach for when something will not heal. Tendons, ligaments, a gut that has been irritated by painkillers, an injury that has stalled. It is a short chain of amino acids copied from part of a protein your stomach already makes, and the animal research on it is unusually consistent for this category: across a lot of separate rat studies, injured tissue healed faster than it did without it. The gap is that this has largely not been repeated in people, and it is not an approved medicine, so nobody is checking what is in the vial you buy.
3
Gene variants
19+
Studies
Sourcing & access
Where to buy GHRP-6
GHRP-6 is sold as a research compound, not a licensed medicine, so quality and legal status vary widely by country and vendor. If you're sourcing it, treat independent purity testing as non-negotiable.
- Insist on a recent third-party Certificate of Analysis (COA) for the exact batch — labs like Janoshik verify purity and identity.
- Check the legal status where you live before ordering — it differs from country to country.
- Reconstitute correctly with bacteriostatic water and start at a conservative dose.

GHRP-6
The original GH releaser — and the hungriest
$19.95at Swiss Chems
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Before you buy: see whether your DNA actually responds to GHRP-6, and at what dose. Analyze my DNA — $99 →
Educational information only, not medical advice. Some outbound links are affiliate links (disclosed, at no extra cost to you). Most peptides are not FDA-approved — consult a qualified professional and check your local laws before purchasing.
Worth knowing before you consider GHRP-6
Interactions and situations where there is a specific reason to be careful. Where the honest answer is that nobody has studied something, it says so and says what that leaves open.
- Do not use it while trying to lose weight
- Obvious once said, routinely ignored. This compound makes you hungry on purpose.
- Ipamorelin exists
- If you want the growth hormone pulse without the hunger, cortisol and prolactin, that is what ipamorelin was designed for and why it largely replaced this.
Last updated
Frequently Asked Questions
What is GHRP-6 used for?
GHRP-6 is used to stimulate natural growth hormone release for body composition, recovery and sleep — and notably to increase appetite. Its strong ghrelin-mimetic action makes it popular with hard-gainers, but it is less selective than Ipamorelin and can raise cortisol and prolactin at higher doses.
Why does GHRP-6 make you so hungry?
GHRP-6 acts on the same receptor as ghrelin, your body's hunger hormone. Activating GHS-R1a in the hypothalamus triggers a sharp appetite increase, usually within 20–30 minutes of dosing. The intensity varies by genetics — GHRL and GHSR variants influence how strong the effect is.
Does genetics affect GHRP-6 response?
Yes. GHSR variants set how many ghrelin receptors GHRP-6 can activate, the GHRL Leu72Met variant shapes the appetite and GH response, the GHR d3 polymorphism affects downstream GH sensitivity, and somatostatin variants influence how strongly your body counteracts the pulse. A genetic peptide report profiles these for dose optimization.
Learn more about GHRP-6
12 guides mention GHRP-6→stacking
Peptide Stacking 101: The Rules, the Risks, and the Science
13 min read
peptide guides
GHRP-2 Dosage Protocol: Why Pharma Abandoned It and What That Means for Your Cycle
12 min read
peptide guides
Hexarelin: 9 Things Nobody Tells You About the Strongest GHRP
11 min read
how it works
Ipamorelin Before Bed: How Your Circadian Genes Determine Whether It Improves Your Sleep
12 min read
how it works
When to Take Ipamorelin: Pre-Sleep, Morning, and Post-Workout Protocols Compared
12 min read
genetics
Why Two People on the Same Ipamorelin Protocol Get Completely Different IGF-1 Results
11 min read
Your next move
Two ways forward with GHRP-6.
Not sure it's for you?
How does GHRP-6 relate to your genes?
Your report scores GHRP-6 against your receptor, pharmacogene and pathway variants and shows the genetic markers relevant to it, with commonly cited dosing information to review with a clinician.
Analyze my DNA — $99Already decided?
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