Kisspeptin-54: What It Is and How It Works
Kisspeptin-54 is a messaging molecule your body naturally produces to control reproduction. Think of it like a chemical messenger that tells your reproductive system when to wake up and get to work. People use it medically when that natural messaging system isn't working properly—for things like infertility or when hormone levels are abnormally low.
Here's how it actually operates: Your brain has a command center called the hypothalamus that manages reproduction. Inside that center are special neurons that need to be activated to release another hormone called GnRH, which then triggers the whole reproductive cascade. Kisspeptin-54 is the messenger that activates those neurons. When kisspeptin-54 circulates through your bloodstream and reaches your hypothalamus, it binds to receptors on these neurons like a key fitting into a lock, triggering them to release GnRH in pulses. Because kisspeptin-54 is the full-length version your body naturally makes, it sticks around longer in your system than shorter versions—it takes your body more time to break it down, which means it can have stronger effects. Beyond reproduction, this messenger also influences things like how your body handles glucose and maintains bone density, showing it's a multi-tasking molecule throughout your body.
Dosage Information
Typical Dose
0.3 nmol/kg/hr IV infusion (clinical research)
Frequency
Pulsatile administration required to maintain receptor sensitivity
Administration
Intravenous infusion in clinical research
Half-Life
28 minutes
Notes
Clinical trials use IV infusion to precisely control pulsatile delivery. Subcutaneous research protocols being developed. Continuous administration causes receptor desensitization — pulsatile dosing essential.
Why this matters
Longer-acting kisspeptin form; single injection produces sustained gonadotropin response.
Protocol cycle
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Evidence Score
0.74
Compound Data
Molecular Formula
C258H401N79O78
Molecular Weight
5857.00 g/mol
IUPAC Name
(4S)-4-[[(2S)-1-[(2S)-1-[(2S)-1-[(2S)-2-[[(2S)-2-[[(2S)-2-[[(2S,3R)-2-[(2-aminoacetyl)amino]-3-hydroxybutanoyl]amino]-3-hydroxypropanoyl]amino]-4-methylpentanoyl]amino]-3-hydroxypropanoyl]pyrrolidine-2-carbonyl]pyrrolidine-2-carbonyl]pyrrolidine-2-carbonyl]amino]-5-[[(2S)-1-[[(2S)-1-[[2-[[(2S)-1-[[(2S)-1-[[(2S)-5-amino-1-[[(2S)-5-amino-1-[(2S)-2-[[2-[[(2S)-1-[[(2S)-1-[[(2S)-1-[(2S)-2-[[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-5-amino-1-[[(2S,3S)-1-[(2S)-2-[[(2S)-1-[(2S)-2-[[(2S)-5-amino-1-[[2-[[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-1-[[(2S)-5-amino-1-[[(2S)-1-[[(2S)-1-[[(2S)-6-amino-1-[[(2S)-1-[[(2S)-1-[(2S)-2-[[(2S)-4-amino-1-[[(2S)-1-[[(2S)-4-amino-1-[[(2S)-1-[[(2S)-4-amino-1-[[(2S)-1-[[(2S)-1-[[2-[[(2S)-1-[[(2S)-1-[[(2S)-1-amino-1-oxo-3-phenylpropan-2-yl]amino]-5-carbamimidamido-1-oxopentan-2-yl]amino]-4-methyl-1-oxopentan-2-yl]amino]-2-oxoethyl]amino]-1-oxo-3-phenylpropan-2-yl]amino]-3-hydroxy-1-oxopropan-2-yl]amino]-1,4-dioxobutan-2-yl]amino]-3-(1H-indol-3-yl)-1-oxopropan-2-yl]amino]-1,4-dioxobutan-2-yl]amino]-3-(4-hydroxyphenyl)-1-oxopropan-2-yl]amino]-1,4-dioxobutan-2-yl]carbamoyl]pyrrolidin-1-yl]-4-methyl-1-oxopentan-2-yl]amino]-3-carboxy-1-oxopropan-2-yl]amino]-1-oxohexan-2-yl]amino]-4-carboxy-1-oxobutan-2-yl]amino]-5-carbamimidamido-1-oxopentan-2-yl]amino]-1,5-dioxopentan-2-yl]amino]-3-methyl-1-oxobutan-2-yl]amino]-4-methyl-1-oxopentan-2-yl]amino]-3-methyl-1-oxobutan-2-yl]amino]-1-oxopropan-2-yl]amino]-2-oxoethyl]amino]-1,5-dioxopentan-2-yl]carbamoyl]pyrrolidin-1-yl]-1-oxopropan-2-yl]carbamoyl]pyrrolidin-1-yl]-3-methyl-1-oxopentan-2-yl]amino]-1,5-dioxopentan-2-yl]amino]-5-carbamimidamido-1-oxopentan-2-yl]amino]-3-hydroxy-1-oxopropan-2-yl]amino]-3-(1H-imidazol-5-yl)-1-oxopropan-2-yl]carbamoyl]pyrrolidin-1-yl]-1-oxopropan-2-yl]amino]-3-hydroxy-1-oxopropan-2-yl]amino]-4-methyl-1-oxopentan-2-yl]amino]-2-oxoethyl]carbamoyl]pyrrolidin-1-yl]-1,5-dioxopentan-2-yl]amino]-1,5-dioxopentan-2-yl]amino]-5-carbamimidamido-1-oxopentan-2-yl]amino]-3-hydroxy-1-oxopropan-2-yl]amino]-2-oxoethyl]amino]-3-hydroxy-1-oxopropan-2-yl]amino]-3-hydroxy-1-oxopropan-2-yl]amino]-5-oxopentanoic acid
PubChem CID
71306396Potential Side Effects
Kisspeptin-54 discussions
Quick Facts
- Administration
- Intravenous infusion in clinical research
- Typical Dose
- 0.3 nmol/kg/hr IV infusion (clinical research)
- Frequency
- Pulsatile administration required to maintain receptor sensitivity
- References
- 0 curated + 46 from PubMed
- Clinical Trials
- 17 registered
- Evidence Score
- 0.7 / 100
Frequently Asked Questions about Kisspeptin-54
What is Kisspeptin-54?
Kisspeptin-54 is the full-length 54-amino-acid form of kisspeptin — the most abundant endogenous form in human circulation. Unlike the shorter Kisspeptin-10 which retains the minimal receptor-activating sequence Kisspeptin-54 has different pharmacokinetics and potentially different physiological effects. It is the primary endogenous form secreted by hypothalamic neurons and has been used in clinical studies for reproductive disorders infertility and as a potential treatment for hypogonadism. Understanding Kisspeptin-54 provides context for the emerging class of kisspeptin-based therapeutics.
How does Kisspeptin-54 work?
Kisspeptin-54 acts on KISS1R (GPR54) receptors on GnRH neurons in the arcuate and anteroventral periventricular nuclei of the hypothalamus triggering pulsatile GnRH release. As the full-length endogenous form Kisspeptin-54 has a longer half-life than Kisspeptin-10 due to its larger size and different susceptibility to peptidase degradation. The C-terminal decapeptide (Kisspeptin-10) is the minimum sequence required for receptor activation and is contained within Kisspeptin-54. Beyond its GnRH-stimulating activity Kisspeptin-54 has additional biological effects including roles in glucose metabolism bone density and potentially cardiovascular function through KISS1R receptors in peripheral tissues.
What is the recommended dosage for Kisspeptin-54?
The typical dose is 0.3 nmol/kg/hr IV infusion (clinical research). Pulsatile administration required to maintain receptor sensitivity. Administration: Intravenous infusion in clinical research. Clinical trials use IV infusion to precisely control pulsatile delivery. Subcutaneous research protocols being developed. Continuous administration causes receptor desensitization — pulsatile dosing essential.
What are the side effects of Kisspeptin-54?
Flushing (common with IV administration). Nausea (uncommon). Headache (uncommon). Desensitization with continuous dosing
What is the Kisspeptin-54 cycle protocol?
Kisspeptin-54 is typically cycled continuous. Pulsatile delivery pattern required; continuous administration causes desensitization
Questions reflect common community inquiries. This is not medical advice.