The short version.
If you read nothing else, read this. The whole guide in a handful of bullets.
- What it is: Kisspeptin is a short neuropeptide that sits at the very top of the reproductive hormone cascade. The version people buy is usually kisspeptin-10, a 10-amino-acid fragment.
- What people run it for: libido and sexual desire, and nudging the body's own testosterone and reproductive signaling, sometimes paired with PT-141.
- Typical dose: about 100 mcg subcutaneously once daily, often before bed, in blocks of roughly 30 days on and 30 days off.
- Routes: subcutaneous injection is the standard for self-administration. Clinical studies have also used intravenous and intranasal routes.
- Cycle: pulsatile blocks rather than continuous use, since the body's own hormone pulses matter more than a steady level.
- Honest caveat: the strongest human evidence is from fertility trials in clinical settings, not the community libido protocols. It is sold for research use only, and this is not medical advice.
Quick reference.
| Typical dose | ~100 mcg subcutaneously once daily |
|---|---|
| Routes | Subcutaneous injection (standard); IV and intranasal in studies |
| Frequency | Daily, often before bed, or spaced across the week |
| Cycle length | ~30 days on, 30 days off, in pulsatile blocks |
| Best for | Libido and sexual desire, reproductive-axis signaling |
What is Kisspeptin?
Kisspeptin is a short peptide, which simply means a small chain of amino acids, the same building blocks that make up the proteins in your body. The version vendors usually sell is kisspeptin-10, a 10-amino-acid fragment of a natural protein your body already produces from the KISS1 gene.
Kisspeptin plays a starring role in reproduction. It sits above GnRH, LH, FSH, and the sex hormones, acting as a kind of master switch that tells the brain when to start the whole reproductive cascade. It is part of why puberty begins when it does.
The version sold by vendors arrives as a freeze-dried white powder in a small sealed vial. It is not a steroid, not a stimulant, and not a direct hormone. People reach for it because it is studied for one theme above all: turning up the body's own reproductive signaling, which connects to libido, fertility, and natural testosterone.
Worth saying plainly: kisspeptin is not an approved medicine anywhere. It is sold strictly for research use only, and the strongest human evidence is from fertility and reproductive trials run in clinical settings, not the libido and testosterone protocols sold as research peptides. We get into what that means further down.
How it works in the body.
You do not need a biology degree to follow this. Here is the simple picture, then a little more for the curious.
The core idea is that kisspeptin works upstream, in the brain, rather than on the testes or ovaries directly. It nudges the body's own pulse generator, and that signal then ripples down the rest of the hormone chain.
- It flips the master switch. Kisspeptin binds the KISS1R receptor on GnRH neurons in the hypothalamus, prompting them to release a pulse of GnRH, the hormone that kicks off the whole reproductive cascade.
- It raises LH and FSH. That GnRH pulse tells the pituitary to release luteinizing hormone and follicle-stimulating hormone, which drive testosterone in men and the ovarian cycle in women.
- It is brief by design. Because it nudges your own system rather than replacing a hormone, the signal is short and self-limiting, lasting hours rather than days. That is exactly why it is being studied as a safer fertility trigger.
How to take it: routes of administration.
Kisspeptin is an injectable peptide. Clinical studies have used several routes, but for self-administration the practical choice is subcutaneous. Here is the honest comparison.
| Route | Typical dose | Absorption | Best for | Difficulty |
|---|---|---|---|---|
| Subcutaneous | ~100 mcg | Gradual, ~24h signal | Self-administration | Tiny needle, easy to learn |
| Intravenous | Weight-based | Immediate, very brief | Clinical studies only | Not practical at home |
| Intranasal | Study-only | Rapid, brief | Research settings | Not a standard product yet |
Subcutaneous injection
The standard route for self-administration. A tiny insulin needle goes into the fat just under the skin, not into muscle. Because the peptide releases gradually from the injection site, a subcutaneous shot stretches kisspeptin-10's very short half-life into a steadier signal, which is why people prefer it over the IV boluses used in studies.
Intravenous
Most of the classic human research used IV boluses or infusions, dosed by body weight. This gives precise control for a study, but kisspeptin-10's roughly four-minute circulating half-life makes IV impractical outside a clinical setting. Not something people run at home.
Intranasal
Researchers have shown intranasal kisspeptin can stimulate hormone release rapidly, which is promising. But it is still a research route, not a standard product you can reliably buy, so for now subcutaneous is the realistic choice.
Where to inject.
If you go this route, these are the sites people use. Rotate so no single area gets sore.
The easiest spots are the belly (about 2 inches either side of the navel), the love handles, the front of the thigh, and the back of the upper arms. Rotate every injection.
So which should someone pick? For self-administration, subcutaneous is the only practical answer: the needle is tiny, and gradual absorption from the fat turns a very short half-life into a useful daily signal. IV and intranasal belong to the research world, not the bathroom counter.
Reconstitution: mixing it.
Kisspeptin arrives as a dry powder, so before you can inject it you reconstitute it, which just means adding liquid to turn the powder into something you can draw into a syringe. It sounds technical but takes about a minute.
Once it is mixed, the only real question is how many units to draw. That depends on your vial size, your water amount, and your target dose, and it is easy to get wrong by hand.
- Use bacteriostatic water, often called BAC water. The small amount of preservative keeps the mixed vial usable for a couple of weeks.
- Add the water slowly, down the inside wall of the vial. A common mix is a 5 mg vial plus 2 mL of BAC water, which gives a concentration of 2.5 mg/mL.
- Swirl, do not shake. Gently roll the vial until the powder dissolves. Shaking can damage the peptide.
- Store it in the fridge once mixed, keep it out of direct light, and use it within a couple of weeks, since kisspeptin-10 can degrade faster than longer peptides.
Open the dosage calculator to turn your vial and dose into an exact number of units. As a worked example: a 5 mg vial mixed with 2 mL of BAC water gives 2.5 mg/mL, so a 100 mcg dose is 0.04 mL, which is 4 units on a U-100 insulin syringe, and that vial holds about 50 doses.
Dosing by goal.
There is no single official dose for kisspeptin, because it is not an approved medicine. What follows is the range people commonly run, organized by goal. The defining feature of kisspeptin dosing is that pulses matter more than a steady level.
Libido and desire
The most common community pattern is about 100 mcg subcutaneously once daily, often dosed before bed for an even overnight signal. People run it in blocks rather than indefinitely, judging it over days to a few weeks.
Reproductive-axis support
Men chasing a bump in natural testosterone signaling use a similar dose, sometimes spaced across the week (such as Monday, Wednesday, Friday) to mimic the body's pulsatile rhythm rather than flooding the system daily.
What the studies used
Clinical trials dosed very differently, with weight-based IV boluses or infusions in a controlled setting. Those numbers do not translate directly to a subcutaneous home protocol, so treat the community ranges as informed guesses, not established doses.
Once-daily subcutaneous dosing, often before bed, run in a block of roughly 30 days rather than continuously.
Some people space doses across the week to mimic the body's natural pulses instead of dosing every day.
Cycling and timing.
A cycle just means a defined run of time on the peptide, followed by a break. For kisspeptin the common pattern is a block of roughly 30 days on, then 30 days off, rather than running it indefinitely.
Why pulse it rather than run it forever? Partly because the body's own reproductive signaling is naturally pulsatile, and partly because the long-term human safety data on these community protocols does not exist yet. The cautious approach is a focused block, then a break.
- Hold a consistent schedule through your on-block, either daily or at even spacing across the week.
- Take a real break between blocks rather than running it continuously, since pulses matter more than a constant level.
- Loop in a provider if you are using it to address a real symptom like low libido or low testosterone. That is a conversation for a clinician, not a forum.
Stacking Kisspeptin.
Kisspeptin is often paired with other peptides that work on libido or the reproductive axis. It is rarely the whole picture on its own.
Libido & arousal
Two different angles on libido. Kisspeptin works upstream on the hormone cascade and builds over days, while PT-141 acts more acutely on arousal pathways in the brain. People run them together to cover both the slow and the on-demand side of desire.
View stack →Reproductive signaling
Both nudge the body's own GnRH and LH/FSH signaling rather than replacing hormones. People exploring a natural testosterone or fertility-axis restart sometimes pair them, though the evidence for this specific combination is thin.
View stack →See full recipes, dosing, and how people run them on the stacks page.
Side effects and safety.
In clinical studies, kisspeptin has a notably clean safety record, with no serious adverse events reported across more than 150 subjects at a wide range of doses. When side effects show up at all in community use they tend to be mild. The ones people mention most often are:
- Injection-site irritation, a little redness or a small bump, which is why rotating sites matters.
- Mild flushing or warmth shortly after a dose in some people.
- Headache or lightheadedness, occasionally reported early in a block.
- Shifts in libido or mood, which are the intended effect but can feel unexpected at first.
Who should be cautious.
Some people have clear reasons to be extra careful, or to avoid kisspeptin entirely until they have spoken with a licensed provider.
- Pregnant or breastfeeding. Kisspeptin acts directly on the reproductive axis, so this is a hard avoid without a clinician's guidance.
- Hormone-sensitive conditions. Because it raises LH, FSH, and downstream sex hormones, anyone with a hormone-driven condition should talk to a provider first.
- Competing athletes. Kisspeptin and its analogues are banned by WADA and will show up as a prohibited substance.
- Anyone on hormone therapy or fertility treatment. Kisspeptin can interact with that signaling, so coordinate with the prescribing clinician rather than improvising.
And the universal one: whoever you are, talk to a licensed healthcare provider before starting kisspeptin. This guide is educational, not a substitute for personalized medical advice.
Where to buy it safely.
This is where a lot of beginners get burned, because peptide quality varies wildly between vendors and the cheapest vial is not always the real deal. Our honest take: do not shop on price alone, shop on price plus independent lab data.
- Compare vendors side by side. Price ranges are wide, and the difference between the lowest and highest listing can be large for the exact same compound.
- Look for recent third-party lab tests. The gold standard the community looks for is a recent Janoshik certificate of analysis showing purity for the batch you are actually buying.
- Confirm it is kisspeptin-10. Several kisspeptin fragments exist, so check the listing specifies the isoform you want and that a recent COA backs it up.
- Be skeptical of suspiciously cheap listings with no testing behind them.
That is exactly the comparison we put together. On our Kisspeptin product page you can compare vendor prices, see which batches have public lab data, and view the grades we assign from that data. From there you can head to the buy page to line up your options.
Questions, answered straight.
Is Kisspeptin legal?
Kisspeptin is not an approved drug and is not sold for human use. The vendors we compare offer it strictly for research use only. It is also on WADA's prohibited list, so competing athletes should steer clear. Rules vary by country, so check what applies where you are.
Is kisspeptin the same as PT-141?
No. PT-141 acts on melanocortin and arousal pathways more acutely, while kisspeptin works upstream on the reproductive hormone cascade and builds over days. They are different molecules with different mechanisms, though people sometimes run them together for libido.
Does it actually raise testosterone?
In men, kisspeptin can drive LH, which tells the testes to make testosterone, and studies show acute rises. Whether the community subcutaneous protocols produce a meaningful, lasting bump is far less established, so keep expectations honest and involve a provider.
How long until it works?
Acute hormone shifts happen within minutes to hours of a dose, but subjective libido changes are usually described over days to a couple of weeks. It is not a single on-demand dose like some other libido peptides.
Does it need refrigeration?
Keep the sealed, freeze-dried vial in the fridge and out of light. Once you mix it with bacteriostatic water, store it refrigerated and use it within a couple of weeks. Kisspeptin-10 can degrade faster than longer peptides, so do not let a mixed vial linger, and never freeze it.
How do I figure out the dose in units?
Use our calculator. Enter your vial size, how much bacteriostatic water you added, and your target dose, and it tells you exactly how many units to draw on a U-100 syringe. The dosage calculator handles the math for you.