Kisspeptin
A short neuropeptide that sits at the very top of the reproductive hormone cascade. People run it for libido and sexual desire, and to nudge the body's own testosterone and reproductive signaling, often as a gentler alternative to a stimulant-style libido peptide.
Where to buy Kisspeptin, cheapest first.
Prices from 8 vendors across the market. We link straight to each vendor’s product page and grade vendors on public lab data, so you’re not just chasing the lowest number.
Kisspeptin
What Kisspeptin actually does.
The simple version first, then a little more for the curious. No biochem degree required.
It pushes the master switch above your own hormones, telling the brain to release GnRH, which in turn raises LH, FSH, and downstream testosterone or estrogen.
How it works
Kisspeptin binds the KISS1R receptor on GnRH neurons in the hypothalamus. That triggers a pulse of GnRH, which signals the pituitary to release LH and FSH, the hormones that drive testosterone in men and the ovarian cycle in women.
Where it acts
It works upstream, in the brain, rather than on the testes or ovaries directly. Because it nudges the body's own pulse generator instead of replacing a hormone, the signal it creates is brief and self-limiting, lasting hours rather than days.
What people notice
Most reports center on libido and sexual desire, with some men also chasing a bump in natural testosterone signaling. Acute hormone shifts happen within minutes to hours; subjective libido changes are described over days to weeks.
Honest caveat: the strongest human evidence is from fertility and reproductive-medicine trials, where kisspeptin is given in controlled clinical settings, plus small studies on sexual brain activity. The community libido and testosterone protocols sold as research peptides are far less proven. It is not an approved medicine and is sold strictly for research use only. None of this is medical advice, talk to a licensed provider before starting anything.
How to take it.
Kisspeptin is an injection, given subcutaneously into fat with a tiny insulin needle. Kisspeptin-10 has a very short half-life, so a subcutaneous shot, which releases the peptide gradually, is what people run rather than the IV boluses used in clinical studies. The routine is below; for cycling and timing, see the full guide.
Reconstitute the vial
Add bacteriostatic water down the side of the vial (a 5mg vial + 2mL = 2.5mg/mL). Let it dissolve. Swirl gently, don't shake.
Draw your dose
On a U-100 insulin syringe, pull to your unit mark. 100mcg at 2.5mg/mL is 4 units (0.04mL). Use the calculator if you're unsure.
Pinch and inject
Swab with alcohol, pinch a bit of fat, insert at 45–90°, push slowly. Subcutaneous into the belly is simplest. Many people dose before bed for an even overnight signal.
Rotate your sites
Move to a different spot each time so no area gets sore or lumpy. Store the vial in the fridge between doses and use it within a couple of weeks.
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.
Don't do the math, let the calculator do it.
This is Kisspeptin's typical setup, already worked out. Change any value and the draw updates instantly.
Typical Kisspeptin dose: about 100 mcg subcutaneously once daily, often before bed, run in pulsatile blocks of roughly 30 days on and 30 days off rather than continuously. Some people space doses (such as Monday, Wednesday, Friday) instead of daily.
How to cycle Kisspeptin.
How long people run Kisspeptin, when to take a break, and the honest reasoning behind it.
Run in pulsatile monthly blocks.
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.
Want the full picture, on and off periods, the washout, stacking, and keeping your results? Read how peptide cycling works →
What's actually in the vial.
For 3 of these vendors we link the per-batch certificate itself (a specific lab report, COA PDF, or certificate image), and the purity below is read straight off that certificate. The rest link to the vendor's general lab-results page. We don't run the labs ourselves and we don't show a purity number unless it's printed on a certificate we link, so you can open the document and check it against the batch yourself.
| Vendor | Purity (per COA) | Batch / report | Certificate |
|---|---|---|---|
| EZ Peptides | 99.457% | EZP-KISS1002092026-01 | Janoshik report ↗ |
| Onyx Biolabs | 99.899% | KIS10-260323A | View COA ↗ |
| Swiss Chems | 99.8% | AY0524 | View COA ↗ |
| Next Gen Peptides | see lab page | not shown | Lab results ↗ |
| Penguin Peptides | see lab page | not shown | Lab results ↗ |
| Spartan Peptides | see lab page | not shown | Lab results ↗ |
What people pair it with.
Kisspeptin is often paired with other peptides that work on libido or the reproductive axis. These are the combinations the community reaches for when sexual health is the goal.
Libido & arousal
Two different angles on libido. Kisspeptin works upstream on the hormone cascade and builds over days; 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.
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 combination is thin.
View stack →Mood & connection
A more experimental pairing aimed at desire plus the bonding and mood side of intimacy. Oxytocin is dosed very differently (usually intranasal), so the two run on separate rhythms.
View stack →In the same corner.
Other sexual-health and reproductive peptides people compare against Kisspeptin.
Questions, answered straight.
Is Kisspeptin legal?
Kisspeptin isn't an approved drug, and it isn't sold for human use. The vendors we compare offer it strictly for research use only. Kisspeptin and its agonist analogues are also on WADA's prohibited list, so competing athletes should steer clear. Rules vary by country, so check what applies where you are.
What does research use only actually mean?
It means the product is sold for laboratory and research purposes, not as a supplement or medicine for people. It hasn't been reviewed or approved for human use by the FDA. We aggregate prices and public lab data so you can see the landscape; what you do with that is between you and a licensed provider.
How do I store it?
Keep the sealed, freeze-dried vial in the fridge, and out of direct light. Once you mix it with bacteriostatic water, store it refrigerated and use it within a couple of weeks, since kisspeptin-10 can degrade faster than longer peptides. Don't freeze a reconstituted vial.
How often do people dose it?
A common pattern is about 100 mcg subcutaneously once daily, often before bed, in blocks of roughly 30 days on and 30 days off. Some people space doses across the week instead. Use the calculator to turn your vial and dose into exact units.
Is it 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. People sometimes run them together, but they are different molecules with different mechanisms.