PeptideCompareGonadorelin — EU research guide.
Gonadorelin is the native gonadotropin-releasing hormone (GnRH) — a decapeptide used clinically for fertility testing and, in the research/biohacking community, to help maintain testicular function during testosterone therapy.
What is Gonadorelin?
Gonadorelin stimulates the pituitary to release LH and FSH, which in turn drive natural testosterone production and spermatogenesis. Pulsatile dosing mimics the body's own GnRH rhythm; continuous dosing instead desensitises the pituitary — the opposite effect, used deliberately by long-acting GnRH agonist drugs.
Clinical and research use
Clinically, gonadorelin is used for diagnostic pituitary-function testing and, off-label, alongside exogenous testosterone to help preserve fertility and testicular size — the same rationale behind hCG use, though gonadorelin acts one step higher in the hypothalamic-pituitary-gonadal axis.
EU legal status
Approved as a prescription medicine in several EU countries for diagnostic use; also available as a research-grade peptide. WADA prohibits GnRH and its agonists for male athletes (S2), since they can raise endogenous testosterone.
Molecular information
Pharmacokinetics
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Frequently asked questions
What is Gonadorelin? ▾
Gonadorelin is a GnRH decapeptide that stimulates the pituitary to release LH and FSH, which in turn drive natural testosterone production and spermatogenesis.
Why does the dosing pattern matter for Gonadorelin? ▾
Pulsatile dosing mimics the body's own GnRH rhythm, whereas continuous dosing desensitises the pituitary, the opposite effect, which is used deliberately by long-acting GnRH agonist drugs.
How is Gonadorelin used clinically? ▾
It is used for diagnostic pituitary-function testing and, off-label, alongside exogenous testosterone to help preserve fertility and testicular size.
How does Gonadorelin differ from HCG? ▾
Both aim to preserve fertility and testicular size, but gonadorelin acts one step higher in the hypothalamic-pituitary-gonadal axis by stimulating the pituitary rather than the testes directly.
Is Gonadorelin legal in the EU? ▾
It is approved as a prescription medicine in several EU countries for diagnostic use and is also available as a research-grade peptide.
Is Gonadorelin banned in sport? ▾
Yes. WADA prohibits GnRH and its analogs in males (S2).