Kisspeptin (KP-10)
KISS1 Gene Product · Reproductive Neuropeptide
Overview
Kisspeptin acts as a master regulator of the reproductive system, stimulating GnRH neurons essential for puberty, fertility, and reproductive function.
Binds to GPR54/KISS1R receptors on hypothalamic GnRH neurons, triggering pulsatile GnRH release, which stimulates pituitary LH/FSH secretion and gonadal steroid production.
Restores reproductive hormone secretion in functional or congenital cases by stimulating dormant GnRH axis.
Triggers oocyte maturation with 45% live birth rate and zero severe OHSS cases; safer than hCG.
Restores reproductive hormone pulsatility in women with hypothalamic amenorrhea.
Modulates sexual brain processing; increases penile tumescence by 56% vs placebo.
Mechanism
Kisspeptin acts as a master regulator of the reproductive system, stimulating GnRH neurons essential for puberty, fertility, and reproductive function.
Binds to GPR54/KISS1R receptors on hypothalamic GnRH neurons, triggering pulsatile GnRH release, which stimulates pituitary LH/FSH secretion and gonadal steroid production.
Restores reproductive hormone secretion in functional or congenital cases by stimulating dormant GnRH axis.
Research areas
- Kisspeptin acts as a master regulator of the reproductive system, stimulating GnRH neurons essential for puberty, fertility, and reproductive function.
- Binds to GPR54/KISS1R receptors on hypothalamic GnRH neurons, triggering pulsatile GnRH release, which stimulates pituitary LH/FSH secretion and gonadal steroid production.
- Restores reproductive hormone secretion in functional or congenital cases by stimulating dormant GnRH axis.
- Triggers oocyte maturation with 45% live birth rate and zero severe OHSS cases; safer than hCG.
- Restores reproductive hormone pulsatility in women with hypothalamic amenorrhea.
- Modulates sexual brain processing; increases penile tumescence by 56% vs placebo.
- Modulates sexual and attraction brain processing; increases self-reported sexiness.
- Preclinical evidence suggests influence on energy expenditure and activity levels.
Research notes
- Minimal acute side effects reported
- Potential mild cardiovascular effects
- Ovarian hyperstimulation signs: severe pelvic pain, bloating, nausea
- Chest pain or cardiovascular symptoms
- Severe headaches or visual disturbances
- Persistent injection site reactions
- Not recommended during pregnancy or breastfeeding
- Caution with cardiovascular disease history
- Daily dosing causes receptor desensitization
- 2025 research shows intranasal kisspeptin-54 (12.8 nmol/kg) rapidly stimulates LH in both healthy subjects and women with hypothalamic amenorrhea. It's non-invasive and convenient, though injectable routes remain better studied for reproductive applications.
References
- pubmed.ncbi.nlm.nih.gov/26192876/
- pubmed.ncbi.nlm.nih.gov/36735255/
- pubmed.ncbi.nlm.nih.gov/36287566/
- pubmed.ncbi.nlm.nih.gov/40215751/
FAQs
Is kisspeptin better than hCG for IVF ovulation triggering?
Yes, significantly. Kisspeptin-54 achieved 45% live birth rates with zero severe OHSS cases, compared to hCG's higher OHSS incidence. It triggers oocyte maturation more physiologically by stimulating the body's natural LH surge rather than replacing it with exogenous hormone.
Why do men respond to kisspeptin injections?
Kisspeptin stimulates GnRH neurons, triggering the hypothalamic-pituitary-gonadal axis. A single injection increases LH 3-5 fold, which then stimulates testosterone production. In a 2023 trial, kisspeptin increased penile tumescence by 56% versus placebo in men with erectile dysfunction.
Can I use kisspeptin daily?
No. Daily kisspeptin dosing causes receptor desensitization within days, making the peptide ineffective. Use only 2-3 times weekly maximum. For IVF, a single strategic dose triggers ovulation. For sexual function, spacing doses 48+ hours apart maintains responsiveness.