Gonadorelin

Overview

Gonadorelin is a synthetic decapeptide identical to endogenous gonadotropin-releasing hormone (GnRH/LHRH; sequence pyroGlu-His-Trp-Ser-Tyr-Gly-Leu-Arg-Pro-Gly-NH2). It was historically FDA-approved as Factrel (diagnostic GnRH stimulation test) and Lutrepulse (pulsatile IV pump for hypothalamic amenorrhea); both products are discontinued in the US. Gonadorelin remains on the FDA Category 1 bulk substances list and is widely compounded, most commonly as an off-label adjunct to TRT intended to preserve HPG-axis signaling.

Mechanism of Action

Gonadorelin binds the GnRH receptor on anterior-pituitary gonadotrophs, triggering release of LH and FSH that drive testicular testosterone production and spermatogenesis (or ovarian follicular development in women). Signaling is pulse-dependent: intermittent pulses every 60–120 minutes preserve receptor responsiveness, while continuous exposure desensitizes the receptor and paradoxically suppresses LH/FSH — the mechanism by which GnRH agonists such as leuprolide are used to treat prostate cancer and endometriosis.

Research Summary

The historical FDA-approved gonadorelin products (Factrel for diagnostic pituitary testing; Lutrepulse for pulsatile ovulation induction in hypothalamic amenorrhea) are discontinued commercially, but gonadorelin remains on the FDA Category 1 bulk substances list and is compounded under 503A/503B. Pulsatile pump delivery (every 60–120 minutes) is the clinical gold standard for hypothalamic amenorrhea and congenital hypogonadotropic hypogonadism, with systematic-review evidence supporting high ovulation rates (Tranoulis 2018, PMID 29605411) and faster spermatogenesis versus cyclical hCG/hMG in CHH men (Zhang 2018/2019, PMID 30569789; Büchter 1998, PMID 9758439). Use as a TRT adjunct in place of hCG is widespread in men's-health practice but is off-label and has limited dedicated controlled-trial data; its ability to maintain intratesticular testosterone once the HPG axis is fully suppressed by exogenous testosterone has not been rigorously established.

Vendors selling Gonadorelin

Scored vendors carrying Gonadorelin, ranked by trust grade. Grades are computed from indexed Certificates of Analysis. Full $/mg pricing is on the comparison page.

Prescribers who offer Gonadorelin

12 prescribers in our directory work with Gonadorelin, each confirmed from their own website. Peptides like Gonadorelin require a prescription from a licensed provider.

Reported Side Effects

• Injection site reactions
• Transient headache
• Nausea (uncommon at low SubQ doses)
• Flushing
• Receptor desensitization with continuous or excessive dosing (paradoxical LH/FSH suppression)

Compare Gonadorelin with Others

Research References

• The Pulsatile Gonadorelin Pump Induces Earlier Spermatogenesis Than Cyclical Gonadotropin Therapy in Congenital Hypogonadotropic Hypogonadism Men (2019)
• Efficacy and safety of pulsatile gonadotropin-releasing hormone therapy among patients with idiopathic and functional hypothalamic amenorrhea: a systematic review and meta-analysis (2018)
• Pulsatile GnRH or human chorionic gonadotropin/human menopausal gonadotropin as effective treatment for men with hypogonadotropic hypogonadism: a review of 42 cases (1998)

Frequently asked questions

Has Gonadorelin been independently lab-tested?

Disclosed Labs has collected 4 Certificates of Analysis (COA) for Gonadorelin from 2 independent testing labs. 3 vendors have submitted material for testing. Products average 99.6% tested purity across the corpus. Full testing data is available at https://www.disclosedlabs.com/peptides/gonadorelin/testing.

What is the average purity of Gonadorelin on the market?

Based on 4 COAs analyzed by Disclosed Labs, Gonadorelin products average 99.6% (±0.3%) tested purity. Individual vendor results vary; see per-vendor COA data at https://www.disclosedlabs.com/peptides/gonadorelin/coas.

Where can researchers source Gonadorelin?

2 vendors with Disclosed Labs trust grades currently list Gonadorelin, including Peptidology, Peptide Tech. Compare live prices and lab-verified COAs at https://www.disclosedlabs.com/prices/gonadorelin.

Which prescribers offer Gonadorelin with a prescription?

12 prescribers in the Disclosed Labs directory work with Gonadorelin, each confirmed from their own website. Gonadorelin requires a prescription from a licensed provider. Browse them at https://www.disclosedlabs.com/prescribers?peptide=Gonadorelin.

How does Gonadorelin work?

Gonadorelin binds the GnRH receptor on anterior-pituitary gonadotrophs, triggering release of LH and FSH that drive testicular testosterone production and spermatogenesis (or ovarian follicular development in women). Signaling is pulse-dependent: intermittent pulses every 60–120 minutes preserve receptor responsiveness, while continuous exposure desensitizes the receptor and paradoxically suppresses LH/FSH — the mechanism by which GnRH agonists such as leuprolide are used to treat prostate cancer and endometriosis.

What does the research say about Gonadorelin?

The historical FDA-approved gonadorelin products (Factrel for diagnostic pituitary testing; Lutrepulse for pulsatile ovulation induction in hypothalamic amenorrhea) are discontinued commercially, but gonadorelin remains on the FDA Category 1 bulk substances list and is compounded under 503A/503B. Pulsatile pump delivery (every 60–120 minutes) is the clinical gold standard for hypothalamic amenorrhea and congenital hypogonadotropic hypogonadism, with systematic-review evidence supporting high ovulation rates (Tranoulis 2018, PMID 29605411) and faster spermatogenesis versus cyclical hCG/hMG in CHH men (Zhang 2018/2019, PMID 30569789; Büchter 1998, PMID 9758439). Use as a TRT adjunct in place of hCG is widespread in men's-health practice but is off-label and has limited dedicated controlled-trial data; its ability to maintain intratesticular testosterone once the HPG axis is fully suppressed by exogenous testosterone has not been rigorously established.