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Gonadorelin

Synthetic gonadotropin-releasing hormone used diagnostically and therapeutically for reproductive hormone assessment and fertility.

StrongWell-Studied

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This information is for educational purposes. Peptide therapy should be guided by a licensed healthcare provider. Connect with a Noho clinician

What is Gonadorelin?

Gonadorelin is a synthetic version of the naturally occurring gonadotropin-releasing hormone (GnRH), a decapeptide produced by the hypothalamus. When administered in pulsatile fashion, it stimulates LH and FSH release from the pituitary, supporting natural testosterone and estrogen production. It is used diagnostically to assess pituitary function and therapeutically for hypogonadism and fertility.

Why People Talk About It

Maintaining natural testosterone during TRT alternatives

Moderate

Fertility preservation

Moderate

Pituitary function assessment

Strong

Alternative to HCG for testicular function

Emerging

How It Works

Gonadorelin is the master reproductive hormone. Given in pulses (like the body naturally does), it tells the pituitary gland to produce LH and FSH, which then stimulate testosterone or estrogen production. It keeps the entire hormone chain working naturally.

Common Questions

Safety Information

Important Safety Notes

Common Side Effects

Injection site reactionsHeadacheNauseaFlushing

Cautions

  • Must be administered in pulsatile fashion for stimulatory effect
  • Continuous administration causes receptor desensitization (like leuprolide)
  • Timing and frequency of dosing are critical

What We Don't Know

Well-characterized safety profile for diagnostic use. Long-term therapeutic use data is more limited.

Published Research

32 studies

Effect of 200 µg of gonadorelin at the first gonadotropin-releasing hormone of the Resynch-25 on ovarian dynamics and fertility in lactating Holstein cows

Randomized Controlled TrialPMID: 38101731

Nerve growth factor from seminal plasma origin (spβ-NGF) increases CL vascularization and level of mRNA expression of steroidogenic enzymes during the early stage of Corpus Luteum development in llamas

Randomized Controlled TrialPMID: 28779611

Equine chorionic gonadotropin increases fertility of grazing dairy cows that receive fixed-time artificial insemination in the early but not later postpartum period

Randomized Controlled TrialPMID: 28601153

Fertility of Angus cross beef heifers after GnRH treatment on day 23 and timing of insemination in 14-day CIDR protocol

Randomized Controlled TrialPMID: 27862440

Fertility of Holstein heifers after two doses of PGF2α in 5-day CO-Synch progesterone-based synchronization protocol

Randomized Controlled TrialPMID: 27125698

Effects of gonadotropin-releasing hormone administration or a controlled internal drug-releasing insert after timed artificial insemination on pregnancy rates of dairy cows

Randomized Controlled TrialPMID: 27030200

Effects on normalized testicular atrophy index (TAIn) in cryptorchid infants treated with GnRHa pre and post-operative vs surgery alone: a prospective randomized trial and long-term follow-up on 62 cases

Randomized Controlled TrialPMID: 25106891

Effect of increasing GnRH and PGF2α dose during Double-Ovsynch on ovulatory response, luteal regression, and fertility of lactating dairy cows

Randomized Controlled TrialPMID: 23932174

Artificial insemination at 56 h after intravaginal progesterone device removal improved AI pregnancy rate in beef heifers synchronized with five-day CO-Synch + controlled internal drug release (CIDR) protocol

Randomized Controlled TrialPMID: 22289222

A multi-centre randomised phase III trial of Dexamethasone vs Dexamethasone and diethylstilbestrol in castration-resistant prostate cancer: immediate vs deferred Diethylstilbestrol

Randomized Controlled TrialPMID: 21285990

Effects of one versus two doses of prostaglandin F2alpha on AI pregnancy rates in a 5-day, progesterone-based, CO-Synch protocol in crossbred beef heifers

Randomized Controlled TrialPMID: 21320721

Pregnancy rates for grade 2 embryos following administration of synthetic GnRH at the time of transfer in embryo-recipient cattle

Randomized Controlled TrialPMID: 12066867

Unchanged response to stimulation of pituitary hormone release after serial UV irradiation in men

Randomized Controlled TrialPMID: 9189734

Bioequivalency comparison between two gonadotropin-releasing hormone products

Randomized Controlled TrialPMID: 7771711

[Value of short-term use of a gonadorelin analog in an in vitro fertilization program]

Randomized Controlled TrialPMID: 2949236

Estrous synchronization strategies to optimize beef heifer reproductive performance after reproductive tract scoring

Clinical TrialPMID: 27045628

Effect of different gonadorelin (GnRH) products used for the first or resynchronized timed artificial insemination on pregnancy rates in postpartum dairy cows

Clinical TrialPMID: 25979657

Endometrial expression of progesterone, estrogen, and oxytocin receptors and of 20α-hydroxysteroid dehydrogenase and cyclooxygenase II 2 and 5 days after ovulation in induced short and normal estrous cycles in dairy cows

Clinical TrialPMID: 24793300

GnRH dose reduction decreases pituitary LH release and ovulatory response but does not affect corpus luteum (CL) development and function in llamas

Clinical TrialPMID: 22365705

Equine chorionic gonadotropin and gonadotropin-releasing hormone enhance fertility in a norgestomet-based, timed artificial insemination protocol in suckled Nelore (Bos indicus) cows

Clinical TrialPMID: 20080296

Treatment of cystic ovarian disease in dairy cows with gonadotrophin-releasing hormone: a field study

Clinical TrialPMID: 9990705

Prospective case control study to determine the effect of lovastatin on serum testosterone and cortisol concentrations in hyperlipidemic nephrotic patients with chronic renal failure

Clinical TrialPMID: 8773342

Efficacy and safety of intravenous pulsatile gonadotropin-releasing hormone: Lutrepulse for injection

Clinical TrialPMID: 2122733

[Comparative clinico-therapeutic study of gonadorelin and chorionic gonadotropin in boys with undescended testes]

Clinical TrialPMID: 2885699

[Treatment of advanced prostatic cancer with a gonadorelin agonist, dTrp6 LHRH. 41 cases]

Clinical TrialPMID: 2934695

Luteinizing hormone-releasing hormone (LHRH) and its analogs for contraception in women: a review

Clinical TrialPMID: 6426857

Effect of a GnRH injection on kisspeptin levels in girls with suspected precocious puberty: a randomized-controlled pilot study

Clinical TrialPMID: 39847034

The efficacy and safety of rhGH treatment combined with letrozole/GnRHa in adolescent boys

Clinical TrialPMID: 39856629

The safety of neoadjuvant hormonal treatment in infants with cryptorchidism

Clinical TrialPMID: 35691791

A comparative study of the effects of intramuscular administration of gonadorelin, mating and intrauterine infusion of either raw seminal plasma or seminal plasma purified β-NGF on luteal development in llamas

Comparative StudyPMID: 28332278

Effect of gonadorelin, lecirelin, and buserelin on LH surge, ovulation, and progesterone in cattle

Comparative StudyPMID: 25890780

Comparison of gonadorelin products in lactating dairy cows: efficacy based on induction of ovulation of an accessory follicle and circulating luteinizing hormone profiles

Comparative StudyPMID: 19394072

Always consult a qualified clinician

This information is for educational purposes. Peptide therapy should be guided by a licensed healthcare provider. Connect with a Noho clinician

Related Peptides

Quick Facts

Class
Gonadotropin-Releasing Hormone
Evidence
Strong
Safety
Well-Studied
Updated
Mar 2026
Citations
32PubMed

Also known as

GnRHLHRHFactrel

Tags

HormonalFertilityDiagnosticFDA-Approved

Related Goals

Evidence Score

Overall Confidence85%

Clinical Trials

View Clinical Trials

Links to ClinicalTrials.gov for reference. Listing does not imply endorsement.

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