What is GHRP-6?
GHRP-6 is the first synthetic GH secretagogue, described in the 1980s by Cyril Bowers, the foundation for all later GHRPs (GHRP-2, hexarelin, ipamorelin). It triggers a strong GH pulse but has the biggest appetite boost of the whole group, which makes it interesting for bulking and impractical for cutting.
Comparison
Three points on the growth hormone axis
Where the peptides from the lexicon act on the growth hormone axis. Tap a card to open its entry.
Simplified: GHRP-6 and GHRH act through different receptors. In the study they amplified each other. 42
How it works
GHRP-6 activates the ghrelin receptor and releases GH through it. Studies show the full effect requires the body's own GHRH, which is why a GHRH analog (CJC-1295 without DAC) pairs especially well: together the pulse is markedly bigger.
The appetite effect is most pronounced here because GHRP-6 strongly mimics the ghrelin signal.
Where it acts
Where GHRP-6 acted in studies
Tap a point or a card. Colour = ghrelin receptor, grey = observed.
Known targets4
Compound PubChem CID 4345065: one described target, Agonist according to studies (target of GH secretagogues).
- Gene
- GHSR
- UniProt
- Q92847
- ChEMBL
- CHEMBL4616
- Action
- Agonist according to studies (target of GH secretagogues)
What you need
Supplies
2 things, numbered as in the picture
Tick off what you already have. Vial and BAC water are our real shop photos at the same size.
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GHRP-6 vial
The GHRP-6 vial (lyophilized powder).
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BAC water, syringes and swabs
Bacteriostatic water, U-100 insulin syringes, alcohol swabs.
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Reconstitution
Use the peptide calculator. A 5mg vial with 2ml water gives 2500mcg per ml, 100mcg is 4 units on the U-100 syringe. Just add the water to the vial and let it dissolve.
Step by step
Dissolving the powder
Four steps, the same for every vial size.
- 1Wipe the cap
Clean the rubber stopper with an alcohol swab.
- 2Add BAC water
Just add it, it does not matter if it hits the powder directly.
- 3Swirl or shake
Until everything has dissolved, both are fine.
- 4Draw up
With the U-100 insulin syringe.
Dosing
Dosing
Dosing, titration and syringe
Loading the dosing information …
- Getting started and stepping up, drawn as a staircase
- Units on the U-100 syringe for every step
- How long one vial lasts
Injection
The injection is subcutaneous, into the fat layer under the skin. Common spots are the abdomen (keep about two finger-widths clear of the navel), the front and the inner side of the thigh, or the back of the upper arm.
The short version:
Injection
Where and at what angle
Pick a spot or switch the angle. Subcutaneous means: into the fat layer, not the muscle.
Rotate the spot each time, never the same one twice in a row.
Rule of thumb: where there is more fat under the skin, insert straight at 90 degrees. In lean people with little fat, 45 degrees, so the needle stays in the fat layer. Simplified diagram.
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Clean the spot with an alcohol swab and let it dry
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Pinch up a small fold of skin
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Insert the needle: at 90 degrees where there is more fat under the skin, at 45 degrees in lean people with little fat
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Inject slowly, wait a moment, then withdraw
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Put the needle straight into the sharps container
Rotate the site each time so the tissue does not get irritated. Never the same spot twice in a row.
Inject fasted. The hunger often kicks in shortly after the shot.
What the research shows
A study (Pandya, Bowers, 1998) showed that a GHRH blocker largely abolished the GH rise from GHRP-6, so the full effect needs the body's own GHRH. That explains why GHRP-6 works best together with a GHRH analog.
Study results
What the trials measured
Interactive: switch tabs, tap points, show or hide arms. Arms are named relative to each other, no dosing advice.
Growth hormone after one dose2
Mean GH peak, 18 healthy men, given into a vein
The study compared three doses, named here from lowest to highest. There were no side effects or abnormal lab values with GHRP-6.
Does GHRP-6 need the body's own GHRH?1
Rise of growth hormone above baseline, 9 healthy men, once with and once without the blocker
The blocker inhibits the GHRH receptor. If the rise then almost disappears, most of the effect of GHRP-6 depends on the body's own GHRH.
Research status
Where the research stands
ClinicalTrials.gov lists no trial of GHRP-6. The human studies date from the 1990s and are not registered there. As of 26 Oct 2026. 8
Side effects
Tolerability
Side effects in the study with 18 men
Single doses into a vein in 18 healthy men.
Prolactin and cortisol roughly doubled at the highest dose. Reviews also list appetite changes, fluid retention, muscle and joint pain as well as blood sugar disturbances for this group of substances.27
Practice
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Fits a bulk well, less so a cut (hunger).
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Strongest as a partner to a GHRH analog.
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Banned in official competition.
Storage
Before mixing the powder is robust, normal room temperature (around 20 to 25 degrees) is fine, ideally kept in the dark. After mixing, keep in the fridge (2 to 8 degrees), do not freeze. It stays good there for at least 4 to 6 months with barely any loss of potency, in practice considerably longer. Swirl or shake to mix, both are fine.
Shelf life
How long it keeps
Robust, no fridge needed. Best kept in the dark.
At least 4 to 6 months with barely any loss of potency.
- Keep it dark
- Dissolved: 2 to 8 degrees
- Note the mixing date on the vial
