Overview
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In plain language
Gonadorelin is a lab-made copy of GnRH, the brain hormone that controls the reproductive system. It is 10 amino acids long.
When released in pulses, GnRH tells the pituitary gland to release the hormones that drive ovulation and sperm production. Given continuously, it does the opposite and shuts the system down. Gonadorelin was used in the U.S. for testing and treating some fertility problems, but those products have been discontinued.
For students
Gonadorelin is synthetic gonadotropin-releasing hormone (pGlu-His-Trp-Ser-Tyr-Gly-Leu-Arg-Pro-Gly-NH2, about 1,182 Da). GnRH was isolated and sequenced in 1971 by the groups of Andrew Schally and Roger Guillemin, work recognized by the 1977 Nobel Prize.
GnRH acts on pituitary GnRH receptors to release LH and FSH. The response depends on pattern: pulses about every 60–120 minutes stimulate the axis, while continuous exposure desensitizes receptors. That principle underlies both pulsatile fertility treatment and the use of long-acting agonists such as leuprolide for suppression.
For researchers and instructors
Clinical history. Used as a diagnostic test of pituitary gonadotropin reserve and, by pulsatile pump, to induce ovulation in hypothalamic amenorrhea. U.S. human products were discontinued; availability differs by country, and it is used in veterinary medicine.
Pharmacokinetics. Half-life of only minutes, due to cleavage at Gly6–Leu7 and Pro9–Gly10, which is the rationale for D-amino acid substitution at position 6 in agonist drugs.
Evidence. Controlled human studies established physiological and diagnostic use.
Molecular identity
- Amino acids
- 10
- Molecular weight
- ~1,182.3 Da
- Formula
- C₅₅H₇₅N₁₇O₁₃
- Sequence
- pGlu–His–Trp–Ser–Tyr–Gly–Leu–Arg–Pro–Gly–NH₂
Origin and history
Gonadorelin is the natural hormone GnRH, which tells the pituitary to release the hormones that control fertility. Finding it was one of the great races in science, between Andrew Schally in New Orleans and Roger Guillemin in Texas and later California. Schally’s team worked through extracts from hundreds of thousands of pig hypothalami and reported the structure in 1971; Guillemin’s team followed with sheep.
Schally and Guillemin shared the 1977 Nobel Prize in Physiology or Medicine (with Rosalyn Yalow). Their rivalry is the subject of the book The Nobel Duel. In 1978 Ernst Knobil showed GnRH must be released in pulses to work; continuous exposure shuts the system down, a discovery that led to drugs such as leuprolide.
Key people
- Andrew V. SchallyNobel Prize 1977
- Roger GuilleminNobel Prize 1977
- Ernst KnobilDiscovered pulsatile GnRH signaling
Timeline
- 1971
Structure of GnRH reported by Schally’s team
- 1977
Nobel Prize to Schally and Guillemin
- 1978
Pulsatile release shown to be essential
See every peptide on one history timeline.
Human evidence
Used historically as a diagnostic test of pituitary function and studied as pulsed treatment for some forms of infertility.
Registration and enrollment are not proof of benefit; check study results directly.
Explore original publications and distinguish preclinical findings from controlled human evidence.
Safety and regulatory status
See every compound on the regulatory tracker.
Former U.S. human products have been discontinued; availability differs by country.
This profile is educational and does not provide treatment, dosing or sourcing guidance.
Sources
- PubMed literature search: Gonadorelin
- PubChem compound search: Gonadorelin
- Nobel Prize in Physiology or Medicine 1977
- ClinicalTrials.gov search: Gonadorelin
Hernandez Gener, E. (2026, November 7). Gonadorelin: molecular data, research history and evidence. VALREXA Biosciences. https://valrexa.com/peptides/gonadorelin.html
APA style · Last reviewed November 7, 2026 · Our editorial standardsLast reviewed November 7, 2026. Trial and regulatory status can change; confirm in the linked registries. This profile is educational and is not medical advice, a treatment recommendation, or dosing or sourcing guidance. Report an error · Corrections policy