GHRP-6
Growth Hormone Releasing Peptide-6
A ghrelin mimetic studied for growth hormone release, with strong appetite effects reported by users.
GHRP-6 is a first-generation synthetic hexapeptide that stimulates the release of growth hormone. It acts as a ghrelin mimetic, binding to the GHS-R1a receptor in the pituitary and hypothalamus. Small 1990s human studies (mostly IV) confirm that it raises GH; no trial has measured muscle or fat-loss outcomes. As of October 2026, it isn't approved as a drug anywhere.
Read the research profile for mechanisms, citations, and safety context before comparing vendors. View the GHRP-6 research profile.
Key Benefits
Mechanism of Action
GHRP-6 mimics the action of ghrelin, the 'hunger hormone,' by binding to and activating the growth hormone secretagogue receptor (GHS-R1a). This activation in the pituitary gland triggers a pulsatile release of growth hormone (GH) into the bloodstream. It also acts on the hypothalamus, further promoting GH release. In a 1990 study of 18 healthy men, cortisol and prolactin also rose about 2-fold at the highest IV dose tested.
Dosing Guidelines
Typical Dose
100-300 mcg per dose
Frequency
1-3x daily
Duration
8-12 weeks
Note: These figures come from user reports and vendor guidance, not trials. Users commonly report subcutaneous injection on an empty stomach, with no food for at least 30 minutes after. Common community timings are upon waking, post-workout, and before bed; we found no GHRP-6 study testing them.
Research & Studies
An overview of the peptide's action on the ghrelin receptor, its effects on growth hormone release, and what small human studies have measured.
Read Full ResearchHow pairing a growth hormone releasing hormone (GHRH) analog like CJC-1295 with a GHRP is thought to increase the pituitary's GH output.
Read Full ResearchHow peptides like GHRP-6 act on the ghrelin receptor (GHS-R1a), which links growth hormone release to hunger signals.
Read Full ResearchPotential Side Effects
Reported side effects may include:
- - Intense hunger soon after injection (very commonly reported by users)
- - Increased cortisol and prolactin (human studies)
- - Water retention or bloating, especially at higher doses (user reports)
- - Tingling sensation in hands and feet (paresthesia; user reports)
- - Injection site redness or irritation (user reports)
- - Higher blood glucose from reduced insulin sensitivity (FDA safety review)
This information is for research purposes only. Always consult with a healthcare professional.
Popular Stacking Options
GHRP-6 + CJC-1295
In a 1990 human study, GHRP-6 and GHRH given together released more GH than either alone. Users apply this by pairing it with CJC-1295, a combination no trial has tested.
Shop this stackGHRP-6 + Ipamorelin
Users often switch from GHRP-6 to ipamorelin when the hunger is unwanted. Both act on the same receptor, so they're usually swapped rather than combined.
Shop this stackGHRP-6 + BPC-157
Some users add BPC-157 for recovery goals. Its tissue and gut repair data come mostly from rodent studies, and no study has tested the combination.
Shop this stackFrequently Asked Questions
Why does GHRP-6 make you so hungry?
GHRP-6 is a ghrelin mimetic, meaning it mimics the action of ghrelin, the body's primary 'hunger hormone,' at the same receptor that controls both GH release and appetite. In human studies, ghrelin and the related peptide GHRP-2 increased food intake. We found no controlled meal study of GHRP-6 itself, so its hunger effect rests mainly on user reports, which describe it as stronger than with other GHRPs like ipamorelin.
Is GHRP-6 or Ipamorelin better?
No human trial has compared them directly. Users describe GHRP-6 as the choice when extra appetite is wanted, such as during 'bulking' phases, and ipamorelin when hunger isn't wanted, such as when cutting. In a 1998 swine study, both raised GH by similar amounts, but only GHRP-6 raised ACTH and cortisol.
What's the difference between GHRP-6 and GHRP-2?
They are very similar first-generation peptides. In a 1998 swine study, GHRP-2 was more potent per dose but produced a slightly lower peak GH than GHRP-6, and both raised ACTH and cortisol. Users report more intense hunger with GHRP-6, though GHRP-2 also increased food intake in a small 2005 human study. Users often describe GHRP-2 as a middle ground between the hunger of GHRP-6 and the selectivity of ipamorelin.
How important is injecting GHRP-6 on an empty stomach?
Community guides treat it as essential, on the reasoning that carbohydrates or fats in the bloodstream blunt the growth hormone pulse. Users typically report injecting at least 2 hours after their last meal and waiting at least 30 minutes before the next one. We found no GHRP-6 study that tested meal timing, so this is community practice rather than a measured effect.
Can GHRP-6 cause gynecomastia?
It isn't a known direct effect, but GHRP-6 can raise prolactin (about 2-fold at the highest IV dose in a 1990 human study). For individuals who are highly sensitive, chronically elevated prolactin can be a contributing factor to gynecomastia; we found no study linking GHRP-6 use to it. Users raise it mainly with long-term, high-dose use, and it's a less common concern than with compounds that aromatize into estrogen.
More from this category
Compare nearby options in the same category before choosing a research product.
CJC-1295
A long-acting GHRH analogue studied in small 2006 human trials for raising growth hormone and IGF-1.
GHRP-2
A ghrelin-mimetic secretagogue studied for its strong effect on growth hormone release.
Hexarelin
A ghrelin-mimetic GH secretagogue studied for growth hormone release and short-term heart effects.
Ipamorelin
A ghrelin-mimicking peptide studied for growth hormone release, with limited human data
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