Kisspeptin is an endogenous neuropeptide encoded by the KISS1 gene that plays a critical role in regulating reproductive hormone secretion. It binds GPR54 (KISS1R) in the hypothalamus, triggering pulsatile GnRH release which drives LH and FSH secretion. It is a key regulator of puberty onset and reproductive function, with mutations in the kisspeptin system identified in central precocious puberty. Active clinical research investigates its use as an IVF oocyte maturation trigger (lower OHSS risk vs hCG), in hypothalamic amenorrhea restoration, testosterone optimization, and fertility support in both sexes.
Category: Reproductive / Hormonal. Evidence rating: C (early/mixed human evidence).
Clinical status: Investigational / Active clinical trials in reproductive medicine
Kisspeptin binds to GPR54 (KISS1R) on GnRH neurons in the hypothalamus, triggering pulsatile GnRH release. This drives LH and FSH secretion from the pituitary, which increases endogenous testosterone/estrogen production. Kisspeptin works through the natural HPG axis cascade without suppressing it…
Research base: 22 registered clinical trials and 141 indexed publications reference Kisspeptin.
Safety considerations: Generally well-tolerated in clinical trials at studied doses; Short-acting -- effects are transient; Continuous administration may cause desensitization/tachyphylaxis of the reproductive axis.
Reviewed by the PeptideAtlas Editorial Team. Last reviewed: 2026-08-12.
Related peptides: Gonadorelin, Oxytocin, Vasopressin.
Compare: Kisspeptin vs Gonadorelin, Kisspeptin vs Oxytocin, Kisspeptin vs Vasopressin.
No. Kisspeptin acts upstream of GnRH -- it stimulates GnRH neurons to release GnRH, which then triggers LH and FSH release. They are distinct peptides with different receptors (GPR54 vs GnRH receptor).
It is actively researched for this purpose, particularly as an IVF trigger with lower OHSS risk than hCG (Jayasena et al., J Clin Invest, 2014). Also being studied for hypothalamic amenorrhea. Not yet approved for fertility treatment.
Kisspeptin works at the very top of the HPG axis (hypothalamus), triggering the natural cascade: kisspeptin -> GnRH -> LH/FSH -> testosterone. Clomiphene blocks estrogen feedback at the pituitary. hCG directly mimics LH at the testicular level. Kisspeptin's advantage is maintaining the full natural cascade without axis suppression.
Kisspeptin is a key trigger of puberty onset. Mutations in KISS1 or GPR54 cause hypogonadotropic hypogonadism (delayed/absent puberty). Gain-of-function mutations can cause central precocious puberty. Understanding kisspeptin has been fundamental to reproductive neuroendocrinology.
Yes. Continuous kisspeptin administration can desensitize the GPR54 receptor and suppress GnRH pulsatility. This is why pulsatile or intermittent dosing protocols are preferred over continuous infusion.