Four things to know · April 15, 2026
Kisspeptin
Kisspeptin-10
Kisspeptin is the peptide your brain uses to control reproductive hormones.
Noticed in days · Full benefit in weeks
Week 2-4
Potential improvements in sexual function and libido
Kisspeptin is the peptide your brain uses to control reproductive hormones. It sits at the top of the chain, signaling the release of GnRH, which triggers testosterone and estrogen production downstream. Kisspeptin-10 is a synthetic version of the active fragment of this naturally occurring peptide. Current research is focused on whether supplementing it can help when this signaling weakens: low testosterone, reduced libido, and certain types of infertility.
How it works
Kisspeptin activates receptors on GnRH neurons in the hypothalamus, triggering GnRH release in pulses. Those pulses tell the pituitary to produce LH and FSH, the hormones that drive testosterone and estrogen production. What makes kisspeptin interesting is that it works at the very top of this chain, stimulating your body's own hormone production rather than replacing it with external hormones.
Key benefits
What early research points to:
- ·Stimulates natural production of reproductive hormones (LH/FSH)
- ·Supports restoration of natural testosterone levels
- ·May improve fertility outcomes in both men and women
- ·Supports sexual function and libido, particularly in people with low hormone levels
Regulatory status
Category 2. The FDA's advisory committee voted against adding kisspeptin to the 503A bulks list in December 2024. Not currently scheduled for further review. Faces a harder path than most compounds because of the prior rejection.
Protocols
| Protocol | Dose | Frequency |
|---|---|---|
| Gonadotropin stimulation | 100-200mcg | Single dose or 2-3x/week |
| Fertility support (KP-54) | 0.4-1.0 nmol/kg (50-150mcg) | As directed by physician |
| Sexual function | 1 nmol/kg/h | 75 min IV infusion (clinical) |
| Research protocols | 0.3-10 nmol/kg | Variable by protocol |
Protocols are from published research literature. This is not medical advice. Dosing should be determined by a licensed clinician.
What people report
Potential improvements in sexual function and libido
What to know
- ⚠Long-term safety data is limited; most human studies are short-duration
- ⚠Some hormonal fluctuation is possible in the first few days as the system adjusts
- ⚠Facial flushing is the most commonly reported side effect, and it is temporary
- ⚠Monitoring hormone levels (LH, FSH, testosterone/estrogen) is advisable during use
- ⚠For fertility applications, medical supervision is strongly recommended
- ⚠Avoid during pregnancy or breastfeeding. The effects on reproductive hormones make this essential
- ⚠If side effects persist beyond the first week, stop use and talk to a clinician
KEY RESEARCH · 3 PAPERS CITED
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