Sexual Health & Hormonal ResearchModerate Evidence
Kisspeptin-54
Full-length 54 amino acid kisspeptin — the master regulator of the HPG axis. Studied for hypogonadotropic hypogonadism, IVF triggering, and pubertal development. Kisspeptin-10 is the active C-terminal fragment.
23 minutes vs ~4 minutes for kisspeptin-10; full length provides more sustained signaling
SKUs
1
Evidence
Moderate Evidence
Kisspeptin-54 is the longest form of the naturally occurring kisspeptin peptides, containing 54 amino acids. It is the predominant form in human circulation. Like kisspeptin-10, it activates the kisspeptin receptor to stimulate GnRH and the reproductive hormone cascade, but its larger size gives it a longer half-life and potentially more sustained effects. It has been used in reproductive medicine research.
Reproductive Endocrinology
Kisspeptin-54 infusion studies have been used to examine hypothalamic regulation of the reproductive axis. Research by Waljit Dhillo and colleagues at Imperial College London established much of the human pharmacology, showing that both pulsatile and continuous kisspeptin-54 infusion affects LH and FSH release patterns differently.
Sexual Function Research
Some research has examined the relationship between kisspeptin signaling and sexual arousal and brain activity related to sexual function. Studies using brain imaging during kisspeptin-54 infusion showed changes in limbic brain activity relevant to sexual response, suggesting kisspeptin has roles beyond reproductive hormone regulation.
Fertility Treatment Research
Like kisspeptin-10, the longer form has been examined for fertility applications. Its longer half-life means it may be more practical for sustained stimulation protocols.
More sustained effects on LH and FSH compared to kisspeptin-10 due to longer half-life.
Brain imaging studies show kisspeptin-54 influences neural circuits related to sexual function and arousal.
Well-characterized human pharmacology from multiple infusion studies.
Not FDA-approved but has been studied in multiple well-designed human research protocols.
Kisspeptin-54 is not approved for any use. The reproductive hormone effects, while well-studied, have not been developed into an approved treatment. The sexual function findings from brain imaging studies are preliminary and their clinical significance is not established. Long-term use safety has not been evaluated.
Kisspeptin-54 works through the same kisspeptin receptor as kisspeptin-10, activating the hypothalamic signal that drives GnRH and downstream reproductive hormones. The key difference is that kisspeptin-54 has 44 more amino acids attached, which makes it larger, slows its clearance from the bloodstream, and extends how long each dose keeps working. Research using infusions has shown that continuously elevated kisspeptin-54 eventually reduces LH pulsatility — a process called desensitization — while pulsatile delivery maintains responsiveness. This has implications for how researchers design protocols when studying this compound. The brain imaging findings showing effects on sexual function circuits suggest the kisspeptin receptor does more than just reproductive endocrinology.
In human research studies, kisspeptin-54 infusions were generally well-tolerated with no serious adverse events reported. Hot flashes related to hormonal fluctuations have been observed in some studies. The reproductive hormone effects it produces — elevated LH, FSH, and sex hormones — carry the same implications as any intervention that manipulates the reproductive axis. Not FDA-approved.
Moderate Evidence
This compound has been studied in Phase 1 or Phase 2 human trials. Evidence is encouraging but more large-scale trials are needed.
Published Research Ranges
1–15nmol/kg IV bolus; 0.0–0.5nmol/kg/hr continuous infusion in human LH studies
Research Context Only: These are ranges reported in published scientific studies for educational reference. They are not dosing recommendations. This is not medical advice. Always consult a qualified healthcare professional.
Sources listed here are from the platform research library. All links open the original publication. No citations are generated by AI.
Kisspeptin-54 Robustly Stimulates Gonadotropin-Releasing Hormone and LH Secretion
Journal of Clinical Investigation • 2005
• DOI: 10.1172/JCI24953
Minireview: kisspeptin/neurokinin B/dynorphin (KNDy) cells of the arcuate nucleus: a central node in the control of gonadotropin-releasing hormone secretion
Kisspeptin restores pulsatile LH secretion in patients with neurokinin B signaling deficiencies: physiological, pathophysiological and therapeutic implications
Kisspeptin neurons as an integration center of reproductive regulation: Observation of reproductive function based on a new concept of reproductive regulatory nervous system
Research Education Only: This profile is for educational purposes only. All information is sourced from published scientific literature. This is not medical advice. Not for human consumption. Consult qualified medical professionals for any health decisions.
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