Gonadorelin: research, uses and evidence

Gonadorelin is synthetic GnRH, identical to the natural hypothalamic hormone. Given in pulses, it stimulates LH and FSH release; given continuously, it shuts the axis down. It is approved in the US as a diagnostic test of pituitary function and has been used in pulsatile pumps to restore fertility.

Structure

pGlu-His-Trp-Ser-Tyr-Gly-Leu-Arg-Pro-Gly-NH2. Identical to natural human GnRH.

How it works

Pulsatile GnRH binds pituitary GnRH receptors and drives gonadotropin release. Continuous exposure causes receptor downregulation, which is the principle behind long-acting GnRH agonists such as triptorelin.

Research use cases

Areas where Gonadorelin has been studied. Inclusion here does not mean it works for that purpose.

Diagnostic assessment of pituitary gonadotropin reserve
Pulsatile therapy for hypothalamic amenorrhoea and hypogonadotropic hypogonadism
Veterinary reproduction

What the research found

GnRH and its analogs

A review of GnRH physiology explains the opposite effects of pulsatile and continuous exposure and how that split led to both fertility treatments and suppressive drugs.¹

Safety and open questions

Short half-life (minutes). Local reactions, headache and, rarely, hypersensitivity.

Regulatory status

FDA-approved (Factrel) as a diagnostic agent for pituitary gonadotropin function. Prescription only.

Status was accurate when this page was last reviewed on October 26, 2026. Regulations change; check with the relevant authority before relying on it.

Gonadorelin: common questions

How is gonadorelin different from triptorelin?

Gonadorelin is identical to natural GnRH and lasts minutes. Triptorelin is a modified, much longer-acting agonist used mainly to suppress the axis.

Is Gonadorelin approved for human use?