Ipamorelin
Definition: A highly selective growth hormone secretagogue that triggers GH release without increasing cortisol, prolactin, or appetite.
What is Ipamorelin?
Ipamorelin is a synthetic pentapeptide and a highly selective Growth Hormone Secretagogue (GHS). It belongs to the class of ghrelin mimetics. Unlike older generation secretagogues (like GHRP-2 or GHRP-6), Ipamorelin is prized in scientific research for its extreme selectivity—it stimulates growth hormone release without causing significant increases in other hormones like cortisol, prolactin, or aldosterone, and does not trigger intense hunger.
How does Ipamorelin work?
Ipamorelin acts as a selective agonist of the Ghrelin/Growth Hormone Secretagogue Receptor (GHSR) in the brain and pituitary gland. Binding to this receptor triggers a signaling cascade that stimulates somatotropic cells in the pituitary to release growth hormone. It also suppresses somatostatin (a hormone that inhibits GH release), further amplifying the natural GH pulse.
Primary Documented Uses
- Stimulating endogenous growth hormone production safely
- Supporting fat loss and lean tissue development
- Improving sleep quality, specifically deep slow-wave sleep
- Accelerating injury recovery and tissue regeneration
Research Summary
In pre-clinical and early phase clinical trials, Ipamorelin demonstrated a clean safety profile and highly effective GH stimulation. Research indicates it supports bone density, increases nitrogen retention, and promotes fat-free mass. Because of its selective pathway, it does not cause the blood sugar fluctuations or severe water retention associated with synthetic growth hormone therapy.
Legal and Regulatory Status
Ipamorelin is not FDA-approved for human use. It was nominated for compounding but was placed on the FDA Bulk Drug Substances Category 2 list in 2023, restricting compounding pharmacies from dispensing it. It is banned by WADA and is legally classified as a research chemical.
Frequently Asked Questions
What is Ipamorelin?
Ipamorelin is A highly selective growth hormone secretagogue that triggers GH release without increasing cortisol, prolactin, or appetite.
How does Ipamorelin work?
Ipamorelin acts as a selective agonist of the Ghrelin/Growth Hormone Secretagogue Receptor (GHSR) in the brain and pituitary gland. Binding to this receptor triggers a signaling cascade that stimulates somatotropic cells in the pituitary to release growth hormone. It also suppresses somatostatin (a hormone that inhibits GH release), further amplifying the natural GH pulse.
What does research say about Ipamorelin?
In pre-clinical and early phase clinical trials, Ipamorelin demonstrated a clean safety profile and highly effective GH stimulation. Research indicates it supports bone density, increases nitrogen retention, and promotes fat-free mass. Because of its selective pathway, it does not cause the blood sugar fluctuations or severe water retention associated with synthetic growth hormone therapy.
Is Ipamorelin FDA-approved or legally available?
Ipamorelin is not FDA-approved for human use. It was nominated for compounding but was placed on the FDA Bulk Drug Substances Category 2 list in 2023, restricting compounding pharmacies from dispensing it. It is banned by WADA and is legally classified as a research chemical.