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HPG Axis & Reproductive

Kisspeptin-10

The most upstream signal of the reproductive axis — triggers GnRH and LH release; studied for hypogonadism, fertility and sexual desire.

RestrictedEvidence level 3 of 5: Limited human dataAlso: KP-10, Metastin 45-54, Kisspeptin decapeptide

Overview

Kisspeptin is the master switch upstream of the reproductive hormone cascade. Neurons in the hypothalamus release it to activate the KISS1R receptor on GnRH neurons, which in turn drive the pituitary to release LH and FSH, and ultimately testosterone or estrogen. Kisspeptin-10 is the shortest fragment that retains full activity. In human studies, a single injection produces a rapid, measurable LH and testosterone pulse in men, and related kisspeptin forms have restored ovulation in some women with hypothalamic amenorrhea and safely triggered egg maturation in IVF. Brain-imaging studies suggest it also enhances sexual and emotional processing. Its very short half-life and the risk of receptor desensitization with continuous exposure make dosing pattern important. It is not FDA-approved and is restricted for compounding.

Classification
Endogenous decapeptide (10 aa) — bioactive C-terminal fragment of kisspeptin (KISS1 gene)
Route
Subcutaneous; intravenous in clinical research
Half-life
~4 minutes (IV); downstream LH effect lasts hours

Mechanism of action

Primary targetKISS1R (GPR54) on hypothalamic GnRH neurons
  1. KISS1R activationBinds Gq-coupled KISS1R receptors on GnRH neurons.
  2. GnRH releaseNeurons depolarize and release GnRH into the pituitary portal circulation.
  3. Gonadotropin surgePituitary secretes LH (strongly) and FSH (modestly).
  4. Gonadal steroidogenesisLH stimulates testosterone in men or ovarian estrogen and ovulation in women.
  5. Limbic signalingKisspeptin also modulates brain regions involved in sexual arousal and mood.
Downstream effects
  • LH and FSH rise
  • Testosterone or ovulation support
  • Enhanced libido signaling

Researched for

  • Hypogonadotropic hypogonadism
  • Hypothalamic amenorrhea
  • IVF ovulation trigger (kisspeptin-54)
  • Low sexual desire (HSDD)
  • Diagnostic testing of the HPG axis

Research notes

  • George et al. (JCEM, 2011): kisspeptin-10 dose-dependently increased LH and testosterone in healthy men.
  • Jayasena et al. (J Clin Invest, 2014): kisspeptin restored LH pulsatility in women with hypothalamic amenorrhea; continuous exposure caused desensitization.
  • Abbara et al. (J Clin Invest, 2015): kisspeptin-54 triggered oocyte maturation in IVF with low OHSS risk.
  • Comninos et al. (JCI Insight, 2017): fMRI showed enhanced sexual and emotional brain processing in men.
  • No long-term safety or efficacy trials of repeated kisspeptin-10 dosing for hypogonadism.

Reported side effects

  • Injection-site reactions
  • Transient LH/FSH spikes and hormone fluctuation
  • Flushing or headache
  • Receptor desensitization with continuous use

Contraindications & cautions

  • Pregnancy
  • Hormone-sensitive cancers (prostate, breast, endometrial)
  • Polycystic ovary syndrome without specialist input
  • Pituitary disorders affecting gonadotropin output

Lab monitoring

  • LH, FSH
  • Total and free testosterone (men) or estradiol/progesterone (women)
  • SHBG, prolactin
  • CBC, CMP
  • Vitamin D (25-OH)
  • Semen analysis if fertility is a goal

Dosing and pricing for Kisspeptin-10

Dosing references and compound pricing are available to established patients in the secure portal after a medical evaluation.

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