Overview
Gonadorelin is classified as a gnrh analog peptide. LH/FSH stimulation, testosterone preservation, HPG axis support during TRT, fertility support.
Synthetic decapeptide identical to endogenous gonadotropin-releasing hormone (GnRH). Binds GnRH receptors in the anterior pituitary, stimulating pulsatile release of luteinizing hormone (LH) and follicle-stimulating hormone (FSH). Used in compounding to maintain testicular function, prevent atrophy, and preserve fertility during exogenous testosterone therapy. Pulsatile dosing is critical — continuous administration causes downregulation.
Also known as: GnRH, LHRH, Gonadorelin acetate, Factrel
Category
GnRH Analog
Half-Life
0.05h
Route
SubQ
FDA Status
Approved
How Does Gonadorelin Work?
Synthetic decapeptide identical to endogenous gonadotropin-releasing hormone (GnRH). Binds GnRH receptors in the anterior pituitary, stimulating pulsatile release of luteinizing hormone (LH) and follicle-stimulating hormone (FSH). Used in compounding to maintain testicular function, prevent atrophy, and preserve fertility during exogenous testosterone therapy. Pulsatile dosing is critical — continuous administration causes downregulation.
At the molecular level, Gonadorelin operates through pathways characteristic of the GnRH Analog class, interacting with target receptors and downstream signaling cascades to produce its observed effects.
Published Research
The following studies are indexed from PubMed and peer-reviewed journals:
[1]Pulsatile GnRH treatment restores gonadotropin secretion and fertility
Leyendecker et al.: Pulsatile GnRH administration effectively restores LH/FSH pulsatility and fertility in hypogonadotropic hypogonadism patients, establishing the pulsatile dosing principle.
Evidence: strong[2]Gonadorelin preserves intratesticular testosterone and spermatogenesis during testosterone replacement
Hsieh et al.: Low-dose hCG (mechanistically analogous to gonadorelin for LH stimulation) maintains intratesticular testosterone and sperm production during TRT, demonstrating the principle underlying gonadorelin co-administration.
Evidence: moderateSafety Profile
FDA-approved as Factrel (historical, for diagnostic testing of HPG axis). Compounded gonadorelin used as TRT adjunct is not itself FDA-approved for this indication. Very short half-life requires frequent dosing. Continuous infusion causes pituitary desensitization and is counterproductive.
| Side Effect | Incidence | Severity |
|---|---|---|
| Injection site reaction | ~10% | mild |
| Headache | ~5% | mild |
| Nausea | ~3% | mild |
Sourcing Gonadorelin for Research
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