Peptide
Ipamorelin
Ipamorelin is used or studied for stimulates gh release and related growth hormone, recovery and performance goals. Potential benefits and safety depend on indication, formulation, dose, and medical supervision.
In depth
How it works
Ipamorelin is a small pentapeptide that activates the ghrelin receptor (GHS-R1a) on the pituitary gland, triggering a pulse of growth hormone release — the same receptor family targeted by older GH-releasing peptides like GHRP-6 and GHRP-2.
What set ipamorelin apart when it was first described is selectivity: it releases GH at levels comparable to GHRP-6 while producing little to no rise in ACTH, cortisol, or prolactin — hormones that older secretagogues in this class tend to elevate as a side effect.
What the research shows
The foundational 1998 paper establishing ipamorelin as a selective growth hormone secretagogue remains the most-cited human/pharmacology reference for its mechanism and selectivity profile. Beyond that mechanistic work, most available evidence is short-duration human pharmacology or animal research rather than large controlled clinical trials, and there is no FDA-approved indication for ipamorelin.
Safety and who should avoid it
Ipamorelin has a short half-life, so protocols built around it typically use multiple daily doses. Commonly reported effects include headache, flushing, and mild water retention, and as a ghrelin-receptor agonist it can also increase appetite.
Detail
Overview
Ipamorelin is used or studied for stimulates gh release and related growth hormone, recovery and performance goals. Potential benefits and safety depend on indication, formulation, dose, and medical supervision.
Benefits, side effects, and protocols
Benefits list
- Stimulates GH release
Side effects
- Headache
- flushing
Vendor protocol
- None listed
Clinical protocol
- None listed
Evidence
- Low
- Often stacked with CJC-1295
Regulatory
- Not Fda Approved
Research
Mechanisms
Evidence notes
- Low
- Often stacked with CJC-1295
Administration
Research links
Contraindications
- None listed
Components
- None listed
Regulatory data
- Not Fda Approved
Aliases
- None listed
Used in these stacks
Related compounds
Half-life
How long does Ipamorelin stay in your system?
Half-life ≈ 2 hours — see what remains after any number of days, and when it is practically cleared.
Guides that cover Ipamorelin
BPC-157, TB-500, CJC-1295 and ipamorelin: what the FDA has actually published about each, why “removed from Category 2” does not mean cleared, and what is still unlawful to compound.
CJC-1295, ipamorelin and MK-677 reliably raise growth hormone and IGF-1 in humans. What the trials have not shown is that raising those numbers produces the outcomes people take them for.
Anti-doping panels detect peptide hormones and secretagogues; standard workplace panels generally do not screen for them. Legality, detectability, and prohibition are three separate questions.
Terminology on this page
Concepts from the glossary that come up around Ipamorelin.
A substance that causes a gland to secrete a hormone the body already makes, rather than supplying the hormone directly.
Growth hormone-releasing peptides — ghrelin-mimetic compounds that trigger growth hormone release through a different receptor than GHRH.
A compound that mimics ghrelin, the hunger hormone, at its receptor — usually to trigger growth hormone release.
Insulin-like growth factor 1 — the hormone, made largely by the liver in response to growth hormone, that mediates most of growth hormone’s effects.
Frequently asked questions
How is ipamorelin different from other growth hormone peptides?
Ipamorelin is described in the pharmacology literature as a selective ghrelin-receptor agonist, meaning it stimulates growth hormone release with comparatively less effect on cortisol and prolactin than some older secretagogue peptides like GHRP-6.
Is ipamorelin FDA approved?
No. Ipamorelin is not approved by the FDA for any human use.
Does ipamorelin increase appetite?
It can. Ghrelin-receptor agonists as a class are linked to hunger signaling, though individual reports of appetite effects vary.
Educational reference only. Pepperz does not provide medical advice, diagnosis, treatment, prescribing guidance, or dosing recommendations. Sourcing Ipamorelin? Check your source before you use anything.