What is Gonadotropin-releasing hormone (GnRH)?

The pulsatile hypothalamic driver of the reproductive axis. Structurally it is Decapeptide (10 aa).

How strong is the evidence for GnRH?

PeptideHormone grades GnRH at the "Established" evidence tier — its mechanism and core effects are settled across the peer-reviewed literature. It is catalogued as an endogenous signal the body produces itself, and the tier is an editorial judgment about the public literature that can change as the science does.

What is the half-life of GnRH?

The reported circulating half-life of GnRH is ~2–4 min.

Gonadotropin-releasing hormoneGnRH

The pulsatile hypothalamic driver of the reproductive axis.

EndogenousEstablishedCompare lineage

Its message is carried in the rhythm rather than the molecule: pulse it and the axis wakes, hold it steady and the axis shuts down.

Identity

Class: Decapeptide (10 aa)
Source: Hypothalamus (GnRH neurons)
Receptor: GnRH receptor (GnRHR), a class A GPCR

Key properties

Evidence floorClinicalREF1CLIN1

Molecular weight

~1,182.3 Da

REF

Half-life (native)

~2–4 min

CLIN

Model dosing

Approximate values for the native hormone; engineered analogs are often deliberately larger and far longer-acting. Each figure carries its own provenance tier, and the floor is the weakest of them - the Standard.

Mechanism

GnRH is released in pulses that drive the anterior pituitary to secrete LH and FSH. Pulse frequency encodes the signal: pulsatile delivery stimulates the axis, while continuous exposure desensitizes the receptor and paradoxically suppresses it.

Reference notes

Pulse frequency, not just amount, is the information GnRH carries.
Continuous GnRH-agonist exposure suppresses the axis via receptor desensitization — the basis of agonist 'down-regulation'.
It sits at the top of the hypothalamic–pituitary–gonadal (HPG) axis.

Common questions

What is Gonadotropin-releasing hormone (GnRH)?: The pulsatile hypothalamic driver of the reproductive axis. Structurally it is Decapeptide (10 aa).
How does GnRH work?: GnRH is released in pulses that drive the anterior pituitary to secrete LH and FSH. Pulse frequency encodes the signal: pulsatile delivery stimulates the axis, while continuous exposure desensitizes the receptor and paradoxically suppresses it.
How strong is the evidence for GnRH?: PeptideHormone grades GnRH at the "Established" evidence tier — its mechanism and core effects are settled across the peer-reviewed literature. It is catalogued as an endogenous signal the body produces itself, and the tier is an editorial judgment about the public literature that can change as the science does.
What is the half-life of GnRH?: The reported circulating half-life of GnRH is ~2–4 min.

Selected literature

Curated peer-reviewed reviews, sourced from PubMed. Selected for relevance, not exhaustive — open any entry on PubMed for the full record and its primary citations.

1.The role of gonadotropin releasing hormone in normal and pathologic endocrine processes · Current opinion in endocrinology, diabetes, and obesity, 2007 · PMID 17940457
2.Gonadotropin-releasing hormone (GnRH) and its natural analogues: a review · Theriogenology, 2006 · PMID 16650469

External references

GnRH in the public knowledge graph — the same entity resolved across the authoritative chemistry and protein databases.