Evidence Grade B — Strong clinical evidence. 294 published studies, 117 human. 608 registered clinical trials.
Medically reviewed by a licensed medical professional
Gonadorelin is the natural form of GnRH — the brain hormone that controls reproductive function. Unlike the modified synthetic versions (leuprolide, goserelin, etc.) that suppress hormones, gonadorelin delivered in pulses can actually restore normal hormone production. Previously available as approved products (Factrel and Lutrepulse), all formulations have been voluntarily discontinued, and it is now available only from compounding pharmacies.
Gonadorelin is also known by these brand and alternate names:
294 published studies: 117 human, 126 animal, 17 in-vitro, 28 reviews
Gonadorelin was previously marketed as Factrel (for diagnostic testing of pituitary function) and Lutrepulse (pulsatile GnRH pump for treating infertility caused by hypothalamic dysfunction). Both have been voluntarily discontinued due to low commercial demand and the complexity of pulsatile administration.
Research suggests that pulsatile gonadorelin remains one of the most physiologically appropriate treatments for certain types of infertility where the underlying problem is insufficient GnRH production in the brain. However, the practical challenges of wearing a pump that delivers pulses every 90 minutes, combined with the availability of simpler alternatives, have made it commercially unviable. It continues to be used in research settings studying reproductive endocrinology and GnRH receptor function.
Gonadorelin is the body's own signalling hormone that tells the pituitary gland to release the hormones (LH and FSH) that drive testosterone and oestrogen production. When given in pulses that mimic the brain's natural 90-minute rhythm, it can actually restore normal hormone function — the opposite of what synthetic GnRH agonists do. When given continuously, however, it causes the same shutdown effect as synthetic agonists, though it is far less potent and shorter-acting because the body breaks it down within minutes.
Research suggests pulsatile gonadorelin remains one of the most physiologically appropriate treatments for infertility caused by insufficient GnRH production — it restores the brain's natural signalling rather than overriding it. However, the practical challenges of wearing a pump that delivers pulses every 90 minutes, combined with simpler alternatives, made it commercially unviable. Compounding pharmacies have filled the gap, particularly for off-label use during testosterone therapy to maintain natural hormone production. No controlled clinical trials exist for these compounding pharmacy use cases. The distinction between pulsatile (stimulatory) and continuous (suppressive) administration is a key pharmacological concept for this compound.
PeptideTrace tracks 608 registered clinical trials for Gonadorelin sourced from ClinicalTrials.gov.
MK-2206+Endocrine Therapy in Patients With Hormone Receptor-Positive Breast Cancer
Human Menopausal Gonadotropin (HMG) vs Recombinant Follicle Stimulating Hormone (rFSH) in Gonadotropin Releasing Hormone (GnRH) Antagonist Cycles
Goserelin, Flutamine, and Radiation Therapy in Treating Patients With Locally Advanced Prostate Cancer
A Study of Dovitinib With Androgen Deprivation Therapy (ADT) in Patients With Metastatic Prostate Cancer Receiving Primary ADT
Psychostimulant Abuse - Novel Treatment Approaches - 1
Health Canada Market Authorisation
Gonadorelin is the native GnRH decapeptide (pyroGlu-His-Trp-Ser-Tyr-Gly-Leu-Arg-Pro-Gly-NH₂). It is the endogenous hypothalamic releasing hormone that regulates the HPG axis. All FDA-approved formulations have been discontinued, making it a research compound in the PeptideTrace classification system.
Gonadorelin binds the GnRH receptor on anterior pituitary gonadotrophs. When administered in a pulsatile pattern mimicking physiological hypothalamic secretion (~90-minute intervals), it stimulates normal LH and FSH release and can restore ovulatory cycles. When administered continuously, it paradoxically suppresses gonadotropin release (the same principle exploited by GnRH agonists). As a single bolus, it produces an acute LH/FSH surge useful for diagnostic testing.
Gonadorelin was formerly marketed as Factrel (diagnostic testing of pituitary gonadotroph function) and Lutrepulse (pulsatile GnRH pump for hypothalamic amenorrhea/infertility). All human NDAs were voluntarily discontinued due to low commercial demand, complexity of pulsatile administration, and availability of simpler alternatives (gonadotropins for fertility, GnRH agonists/antagonists for suppression). Gonadorelin is widely available through US compounding pharmacies, where it is prescribed off-label in men's health protocols as an alternative to hCG for maintaining testicular function during testosterone replacement therapy.
The information on this page is provided for educational and research reference purposes only. This is not medical advice. Always consult a qualified healthcare professional before making any health-related decisions.
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Carbetocin has not been approved by the FDA. It is registered in over 80 countries for prevention of uterine atony and excessive bleeding after caesarean delivery. A heat-stable formulation was added to the WHO Essential Medicines List in 2019. The CHAMPION trial (WHO, 2018; over 29,000 women) compared a heat-stable carbetocin formulation to oxytocin for preventing postpartum haemorrhage after vaginal delivery, and found it to be non-inferior. The heat-stable formulation addresses a significant limitation of oxytocin, which degrades in warm climates without refrigeration — a major concern in low-resource settings where postpartum haemorrhage causes the most deaths. Its regulatory status varies by jurisdiction.
Nafarelin is marketed as Synarel (approved 1990) for endometriosis and central precocious puberty. It requires administration as one spray in each nostril twice daily — a higher frequency than injectable alternatives but avoids needles entirely, which can be a significant advantage for some patients, particularly children. Clinical trials showed symptom improvement in 75–92% of endometriosis patients. However, absorption can be affected by nasal congestion or concurrent use of nasal decongestants, which can be a practical limitation. As with all GnRH agonists, prolonged use leads to bone density loss, and treatment for endometriosis is typically limited to six months. Nafarelin occupies a niche for patients who prefer non-injectable hormone suppression, though it has become less commonly prescribed as longer-acting depot injections and oral alternatives have become available.
Triptorelin is marketed as Trelstar (approved 2000) for advanced prostate cancer, available as intramuscular depot injections in monthly (3.75 mg), three-monthly (11.25 mg), and six-monthly (22.5 mg) formulations. It is also widely used internationally for gender-affirming care and central precocious puberty. Triptorelin is one of the most commonly used GnRH agonists globally, though it faces the same competitive pressure as other agents in this class from newer oral GnRH antagonists like relugolix, which avoid the initial hormone flare and offer potential cardiovascular advantages. Clinical data demonstrate reliable testosterone suppression comparable to other GnRH agonists in this class.
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This content is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional before making decisions about your health.
