The Peptide Atlas
Kisspeptin
The body's master switch for the reproductive hormone system, a peptide discovered surprisingly recently, in the 1990s.
Class
Hypothalamic reproductive peptide
Evidence
Human-tested
Status
Studied in research settings.
Forms
Injection and intranasal, in trials
What people use it for
Mostly research today, but the interest is in sexual desire and reproductive hormones: it sits upstream of testosterone, estrogen, and the brain's sexual responses.
The signal
Kisspeptin neurons in the hypothalamus initiate the entire hormonal cascade of reproduction. No kisspeptin, no puberty, no cycle, no testosterone production. It's the signal the rest of the system waits for.
How it works
It activates receptors on the neurons that release GnRH, the hormone that instructs the pituitary to drive the ovaries and testes. Giving it turns the whole downstream axis up [1].
What the research shows
Human studies show giving kisspeptin reliably stimulates reproductive hormone release [1, 2], and imaging trials found it enhanced sexual-brain processing in men with low desire [3]. This is active academic research with real trials, mostly at Imperial College London, and no approved product anywhere yet.
What people get wrong
That upstream means stronger. Kisspeptin turns the system on; it doesn't override what's downstream, and its desire research is early, with brain-imaging changes rather than proven symptom relief.
References
- Physiol Rev (2025). Kisspeptin and neurokinin B: roles in reproductive health. PubMed
- Eur J Endocrinol (2026). Chronic subcutaneous kisspeptin-10 stimulates gonadotropin secretion for 12 days in healthy men. PubMed
- JAMA Netw Open (2023). Effects of kisspeptin on sexual brain processing and penile tumescence in men with hypoactive sexual desire disorder. PubMed
Last reviewed 2026-08-24. Every reference is verified against the primary literature at review time. How the Atlas grades evidence