Kisspeptin

What Is Kisspeptin?

Kisspeptin is a family of neuropeptides encoded by the KISS1 gene that acts on kisspeptin receptors (GPR54) in the hypothalamus. It is arguably the master regulator of the hypothalamic-pituitary-gonadal (HPG) axis — stimulating GnRH (gonadotropin-releasing hormone) secretion, which drives LH, FSH, and ultimately sex hormone production (testosterone and estrogen).

Kisspeptin's role in puberty initiation, seasonal reproduction, and fertility regulation makes it a compelling therapeutic target. It is being studied for treatment of hypothalamic amenorrhea (absent menstrual cycles), infertility, pubertal disorders, and as a potential alternative to exogenous hormone therapy.

Research at Imperial College London has been particularly prominent. Kisspeptin appears to also have direct effects on sexual motivation and behavior in the brain, making it relevant to sexual health beyond just reproductive hormone regulation.

What The Research Says

Clinical trials have demonstrated kisspeptin can trigger LH/FSH surges and stimulate ovulation in women with hypothalamic amenorrhea. It has been used as a 'trigger injection' for IVF protocols to stimulate oocyte maturation — reducing risk of ovarian hyperstimulation syndrome compared to hCG.

Research in men shows kisspeptin can stimulate testosterone production and improve sexual motivation. Studies in hypogonadal men showed LH and testosterone increases. The direct role of kisspeptin in the brain's sexual processing adds a neurological dimension beyond hormone stimulation.

📚 Key Reference: PMID: 17928584 (Kisspeptin human studies), PMID: 25320263 (infertility)

Common Uses

• Hypothalamic amenorrhea treatment (investigational)
• Infertility — IVF trigger (investigational)
• Hypogonadism in men (research)
• Sexual motivation (research)
• Puberty disorders (research)

Important Safety Information

Generally well-tolerated in clinical trial settings. Side effects include GI symptoms with high doses. As an endogenous peptide, it is expected to have a reasonable safety profile. Full characterization in long-term use is ongoing. Consult your provider.

Questions To Ask Your Provider

1. What specific reproductive or sexual condition is kisspeptin addressing?
2. Is this being considered in the context of fertility treatment?
3. How does kisspeptin compare to other GnRH-based approaches?
4. Are there clinical trials I could enroll in?

Regulatory Status

NOT FDA-approved. Investigational. In clinical trials for infertility and reproductive disorders. Not commercially available outside of clinical trials or specialized research programs.