Peptide guide

Kisspeptin-10

Kp-10, metastin fragment 45–54 — a decapeptide studied for its effect on the reproductive hormone axis and sexual desire.

Kisspeptin-10 is a lab-made peptide that acts at the top of the reproductive hormone axis: it tells the brain to release the signal that drives LH, FSH, and downstream testosterone. Unlike most compounds in this category, a good share of its evidence comes from actual human studies, much of it out of Imperial College London, including work on low sexual desire. It still isn't FDA-approved, and its very short half-life makes the dosing it's sold for more complicated than the simple numbers suggest. The practical questions are how it's actually prepared and how to tell a real source from a scam.

By the Zapify Research team

Reviewed against 8 clinical & research sources · Updated June 2026 · Educational use only

Type: 10-aa peptideKISS1R agonist
Route: Subcutaneousresearch used IV
Typical dose: ~100 mcgreported, not set
Cycle: Short coursespulsed, not daily-forever
Storage: Mixed: ~2-4 wksSealed: months
Status: Not FDA-approved

What is Kisspeptin-10?

A ten-amino-acid synthetic fragment that binds KISS1R on hypothalamic GnRH neurons, switching on the body's own LH, FSH, and downstream sex hormones; not FDA-approved.

Kisspeptin-10 is a peptide, a short chain of amino acids, the same building blocks that make up every protein in your body. This one is ten amino acids long, which is where the name comes from. It's a fragment of a larger natural protein called kisspeptin, encoded by the KISS1 gene, and the body makes its own versions to run the reproductive system.

What makes it interesting is where it acts. Kisspeptin-10 binds a receptor called KISS1R on the GnRH neurons in the hypothalamus, the cells that sit at the very top of the reproductive hormone chain. When those neurons fire, they release GnRH, which tells the pituitary to put out LH and FSH, which in turn drive testosterone in men and the ovarian cycle in women. So Kisspeptin-10 isn't a hormone you're adding to the system; it's a switch upstream of the hormones, nudging the body to release its own.

The version sold online is synthetic, built in a lab from that ten-amino-acid sequence rather than extracted from anything. It's the same fragment researchers have used in human studies, which is less common in this corner of the market than you'd expect.

Kisspeptin-10 isn't FDA-approved for any use. It has been studied in people more than most peptides sold this way, but those studies were run in controlled clinical settings, usually by intravenous infusion, not as something you mix and inject at home. Treat it as an experimental compound, not a prescribed medicine.

What is it studied for?

An Imperial College London group has dosed over 500 men and women, so the open question is whether home dosing reproduces the controlled-trial results.

This is one of the few peptides in the recovery-and-optimization market with a real human research base. Much of it comes from a group at Imperial College London, who have given kisspeptin to more than 500 men and women across multiple trials. That changes the usual caveat: the question here isn't whether it does anything in people, it's whether the way it's sold and self-administered reproduces what the controlled studies showed.

Evidence base, by subject

500+ subjectsHuman studies (controlled, mostly IV)

SparseSubcutaneous self-dosing data

The research has clustered in a few areas:

Reproductive hormonesAn intravenous bolus produced a rapid, dose-dependent rise in LH, with maximal stimulation near 1 mcg/kg; infusion raised testosterone in men. It also increased the pulse frequency of LH, the rhythm the axis normally runs on.

Sexual desire & brain processingIn randomized trials in men and women with low sexual desire, kisspeptin improved sexual brain processing and behavior versus placebo, and boosted attraction-related brain pathways.

Fertility & hormonal disordersA longer relative, kisspeptin-54, has been studied as a trigger in IVF; Kisspeptin-10 itself is used as a tool for probing hypothalamic-pituitary function, where its upstream action is the whole point.

The mechanism is unusually well characterized for this category. The KISS1R-to-GnRH pathway is mapped, and the hormone responses are reproducible in a clinic. What's less settled is durability and route. Kisspeptin-10 clears the blood in a few minutes, so the studies that sustained an effect used continuous infusion, not a single shot. Whether intermittent subcutaneous dosing at home delivers the same downstream result is the open part of the story.

Why people use it

People want to nudge natural testosterone, lift low libido, or restart a stalled axis, but those effects came from controlled, often-infused dosing.

Most people who try Kisspeptin-10 are chasing one of a few things. These are the reasons they reach for it, not proof it delivers when self-administered:

Wanting to nudge natural testosterone by working the top of the axis rather than adding testosterone directly, which suppresses the body's own production.
Low libido or blunted sexual desire, the use with the most direct human trial support.
Restarting a stalled hormonal axis, which is why it gets discussed as a post-cycle option after suppressive compounds.
Fertility-adjacent goals, drawn from the kisspeptin family's role as an upstream signal in reproductive medicine.

The steelman here is stronger than for most peptides: real randomized human trials show effects on LH, testosterone, and sexual brain processing, and the mechanism is well mapped. The catch is that those effects were produced under controlled conditions, often by infusion, in measured doses. The home version, a subcutaneous shot of an unregulated powder, hasn't been validated the same way, and the short half-life means a single injection may not behave like the sustained dosing that generated the data. Worth being curious about, not something to treat as a settled protocol.

How to reconstitute Kisspeptin-10

Handle this less-stable peptide gently; a 5 mg vial in 2.5 mL gives 2 mg/mL, so 5 units on a U-100 syringe is 100 mcg.

Your vial arrives as a small puck of freeze-dried powder. Before it can be drawn into a syringe, it has to be mixed into a liquid, a step called reconstitution. Kisspeptin-10 is on the less stable side as peptides go, so handling it gently matters more than usual.

Step 1Start with powderWipe the rubber stopper with an alcohol swab.

Step 2Add bac. waterRun it slowly down the inside wall — never shake.

Step 3Draw your doseThe calculator gives the exact units to draw to.

Wipe the rubber stopper with an alcohol swab first, every time.
Use bacteriostatic water, not plain sterile water and not saline. The trace of benzyl alcohol in it holds back bacteria, which matters because you'll be drawing from the same vial over time.
Add the water slowly, running it down the inside glass wall. Don't blast it straight onto the powder.
Don't shake it. Swirl gently and let it dissolve on its own. Shaking foams the solution and can damage the peptide.

A common setup is a 5 mg vial mixed with 2.5 mL of bacteriostatic water, which gives 2 mg/mL. On a U-100 insulin syringe, 5 units is then 100 mcg. The water doesn't change how much peptide is in the vial; it only sets the concentration, which decides how many units you draw. More water means a more dilute mix and a bigger draw for the same dose. You can't ruin it with too much or too little, you only change the draw math, and that's exactly what the calculator handles.

Calculate your exact Kisspeptin-10 reconstitution →

Dose & units

No approved dose exists; effect maxed near 1 mcg/kg (about 100 mcg), but it clears in minutes, so small spaced pulses beat one large injection.

There is no FDA-approved dose for Kisspeptin-10. The numbers below are what research papers and clinics report, and most of the rigorous figures come from intravenous studies dosed by body weight, which don't map cleanly onto a subcutaneous home shot. This isn't a medical standard. Decide what goes into your body with a licensed provider, not with this page.

Typical range

The controlled human work used intravenous boluses dosed by weight, with LH responses climbing up to about 1 mcg/kg, where the effect maxed out. For a typical adult that lands near 100 mcg, which is also the figure consumer protocols cite for a subcutaneous dose. The match is convenient but not the same thing: an IV bolus and a subcutaneous injection don't deliver the peptide to the bloodstream the same way.

Timing and pulses

Kisspeptin-10 clears the blood fast, on the order of minutes, far faster than peptides like BPC-157. That short life is why the studies that sustained a hormonal effect used continuous infusion rather than one shot, and why home protocols tend to favor smaller, spaced doses meant to mimic the body's natural pulses rather than one large injection. The body's own kisspeptin works in rhythmic bursts, and flooding the receptor steadily can actually desensitize it, which is the opposite of what you want.

Cycling

Because of the desensitization risk, this isn't framed as something to run continuously at a fixed dose for months. Reports lean toward short, intermittent courses with breaks, rather than daily-forever use. The exact schedules vary widely from source to source, which itself tells you how soft these numbers are.

Onshort course

Offbreak

For the exact mark to draw to on your insulin syringe, don't eyeball it. The calculator turns your vial size, water, and dose into the precise number of units.

Get your exact units →

Storage

Sealed powder keeps for months, but this peptide degrades easily in solution, so refrigerate the mixed vial, use within 2–4 weeks, and avoid repeated freeze-thaw.

Sealed & drySealed dry powder stays stable for months at room temperature and tolerates shipping heat before mixing.

ReconstitutedRefrigerate at 2–8 °C and use within 2–4 weeks; it degrades easily, so keep cold and dark, avoid repeated freeze-thaw, discard if cloudy.

You'll see longer windows quoted for peptide vials. Those figures are beyond-use dates for a sealed, unmixed vial that a compounding pharmacy has stability-tested, and they stop applying the moment you add water. A mixed vial runs on the shorter clock instead, because that's how long the preservative in bacteriostatic water reliably keeps the solution clean once you're drawing from it. Kisspeptin-10 is also a less stable peptide than most, so there's no upside to pushing the window.

That limit is partly about contamination and partly about potency — this peptide is prone to degrading in solution, so keep it cold and out of light, and some users aliquot and freeze it to slow that down. Reconstitute with plain sterile water instead of bacteriostatic and you drop to a day or two, since there's no preservative holding bacteria back.

Don't repeatedly freeze-thaw a working vial, keep it out of direct light, write the mix date on the label, and throw it out if the solution ever turns cloudy or discolored, whatever the date says.

Side effects & safety

Trials show a clean record with flushing most common, but it's banned at all times for male athletes under WADA's S2 since 2024.

Across the clinical trials, kisspeptin has had a clean safety record, with no serious adverse events reported in healthy volunteers. That's a stronger statement than can be made for most peptides in this market, though it still comes from supervised research settings rather than unsupervised home use.

Most common: flushing or a warm feeling, reported in a meaningful share of subjects and tied to the mechanism itself.
Less often: mild nausea, headache, or mild irritation at the injection site.
Because it acts on the reproductive axis, it can shift hormone levels in ways that aren't trivial, especially if you're already on hormonal therapy or have a hormone-sensitive condition.

Talk to a doctor before you start if you have any hormone-sensitive condition, are on testosterone or fertility treatment, or have a history of a hormone-driven cancer. A compound that deliberately moves your reproductive hormones can interact with all of those. Don't use it if you're pregnant or trying to conceive without medical guidance, since it acts directly on the system that governs that.

If you're a tested athlete, this one is not a gray area: kisspeptin, Kisspeptin-10 included, is named on WADA's Prohibited List under S2, the testosterone-stimulating peptides, and is banned at all times for male athletes. It was added as a listed example in 2024 and remains on the 2026 list. Don't treat it as undetectable or unlisted, and confirm the specifics with your sport's anti-doping authority before going near it.

And the biggest risk for non-athletes here isn't really the molecule, which has been through real human trials. It's whether what's in the vial is actually Kisspeptin-10, at the strength on the label. That comes down to where you buy it.

How to vet a source

A short, less-stable peptide is easy to degrade or short undetectably, so demand a batch-specific third-party COA matched to your vial's lot number.

This is an unregulated market, and a real share of independently tested vials come back underdosed, impure, or not even the compound on the label. With Kisspeptin-10 that gap is especially frustrating, because the compound itself has genuine human evidence behind it, and a junk vial throws all of that away. A short, less stable peptide is also easy to degrade or short in ways you can't see in the powder. Where you buy matters more than almost anything else here. The one document that separates a real seller from a gamble is a certificate of analysis: a third-party lab's report on what's actually in the vial.

A real COA shows

An identity test (usually mass spectrometry) confirming the peptide is what the label says.
A purity figure from HPLC, typically 98% or higher.
A lot or batch number that matches the number printed on your vial.
A named, independent accredited lab and a recent test date.

Walk away if

There’s no COA, or it’s a generic image with no lot number.
The “certificate” comes from the seller instead of a third-party lab.
The lot number doesn’t match your vial, or there isn’t one at all.
It’s a flat image you can’t trace back to the lab that issued it.

That's the standard worth holding any seller to, ours included. Ask for the batch-specific COA before you buy, match the lot number to your vial, and don't accept a screenshot in place of a traceable report.

See the Zapify compound catalog →

Common questions about Kisspeptin-10

Is Kisspeptin-10 approved or proven to work in people?

It isn't FDA-approved for any use. It is, unusually for this market, backed by real human trials: groups including Imperial College London have given kisspeptin to more than 500 men and women and shown reproducible effects on LH, testosterone, and sexual brain processing. The gap is that most of that work used intravenous infusion in a clinic, not a subcutaneous shot at home, so the proven effect and the marketed protocol aren't the same thing.

Will Kisspeptin-10 raise my testosterone?

In controlled studies it raised testosterone in men by working upstream, telling the brain to release more LH, which drives the testes. Infusion studies reported testosterone climbing, though the size of the rise varied between studies. Those are research conditions with sustained dosing. Whether an intermittent subcutaneous injection reproduces that is not well established, and its very short half-life makes a single shot behave differently from the infusions that generated the data.

Why does the half-life matter so much for this one?

Kisspeptin-10 clears the blood in a matter of minutes (commonly cited around four). That's why the studies that sustained a hormonal effect used continuous IV infusion rather than a single bolus, and why home protocols favor smaller, spaced doses. Steadily flooding the receptor can also desensitize it, blunting the very response you're after, so more isn't better here.

Is Kisspeptin-10 banned in sport?

Yes. Kisspeptin, with Kisspeptin-10 named among its forms, is on WADA's Prohibited List under S2, the testosterone-stimulating peptides, and is banned at all times for male athletes. It was added as a listed example in 2024 and is still on the 2026 list. If you're a tested athlete, treat it as prohibited and confirm the specifics with your anti-doping authority.

Why bacteriostatic water and not saline or sterile water?

Because you'll be drawing from the same vial over time. Bacteriostatic water carries a trace of benzyl alcohol that holds back bacteria between draws; plain sterile water and saline have no preservative. On a multi-dose peptide vial, the professional sources point the same way: bacteriostatic.

References

This page is for research and educational purposes only. It is not medical advice or a recommendation to use any compound. The dose ranges shown are reported by clinics and research literature, not validated medical standards, and Kisspeptin-10 is not FDA-approved. Talk to a licensed medical provider about anything you put in your body.