Kisspeptin-10
Also known as KP-10, Metastin 45-54, Kisspeptin 112-121
Kisspeptin-10 is the shortest active fragment of kisspeptin, the hypothalamic peptide that sits upstream of GnRH and acts as the master switch for the reproductive axis. People use it to boost LH and testosterone naturally, and research is exploring it for libido and fertility.
Reviewed by the amino101 editorial team. , first published .
Quick start
What people commonly do. Not a prescription.- Typical dose
- 50 to 100 mcg
- How often
- once daily or every other day
- Where
- Subcutaneous, belly or thigh; intravenous only in research settings; intranasal is reported but poorly characterized
- Timing
- Morning or evening, not tied to meals; 1 to 2 hours before intimacy for the libido effect
- Effects timeline
- LH and testosterone rise within hours of each dose and fall back the same day; any lasting change is judged on bloodwork at 4 to 8 weeks
- Storage
- Lyophilized in freezer or fridge away from light; reconstituted in fridge 2 to 8 C, use within 4 weeks
- Cycle length
- 4 to 8 weeks
- Break between
- 2 to 4 weeks, or run every other day to protect the receptor
Overview
Kisspeptin was identified in the 1990s as a metastasis suppressor, hence its original name metastin, and only later found to be the key regulator of puberty and reproduction. People with mutations in the kisspeptin receptor, KISS1R, fail to go through puberty, and those with overactive signaling go through it early. The full peptide is 54 amino acids, but the final ten residues, kisspeptin-10, carry all of the receptor binding activity. Kisspeptin neurons in the hypothalamus are the cells that actually drive GnRH pulses, integrating signals from sex steroids, energy status, and stress.
Human studies from Imperial College London and elsewhere have shown that kisspeptin-10 injections or infusions reliably raise LH, and to a lesser extent FSH, in healthy men and women, with testosterone rising over the following hours in men. Unlike gonadorelin, which acts directly at the pituitary, kisspeptin works through the body's own GnRH neurons, so the resulting LH release keeps a natural pulsatile shape. Researchers have used it to trigger egg maturation in IVF as a gentler alternative to HCG, with lower rates of ovarian hyperstimulation, and to stimulate the axis in hypothalamic amenorrhea.
The most interesting recent work is on sexual function. Trials published in 2023 found that kisspeptin infusion increased brain activity in sexual and emotional processing regions and improved measures of arousal in men with low sexual desire and in women with hypoactive sexual desire disorder. These were small proof of concept studies, but they suggest kisspeptin has effects beyond hormones. Community use is mostly for boosting LH and testosterone on or off TRT, and honest expectations should account for the fact that chronic high dose exposure can desensitize the receptor just like GnRH.
How it works
Kisspeptin-10 binds KISS1R, a G protein coupled receptor on GnRH neurons in the hypothalamus, causing them to fire and release GnRH into the pituitary portal circulation. The pituitary then secretes LH and FSH in a pulse, and LH drives testosterone or estradiol production in the gonads. Because it acts one step above GnRH, kisspeptin preserves the natural rhythm of the axis and is subject to the same feedback from sex steroids. KISS1R is also expressed in limbic brain regions including the amygdala and hippocampus, which appears to underlie its effects on sexual and emotional processing. At high continuous doses the receptor desensitizes and LH falls, so intermittent dosing is important.
Where the research stands
LH and testosterone stimulationStrong evidence
- Acute LH and testosterone rise in men. Human RCTs show a dose dependent rise in LH and testosterone within 1 to 3 hours of a subcutaneous dose.
- Sustained baseline increase. Not shown; repeated dosing raising resting testosterone has no published support and continuous infusion suppresses the axis.
Fertility and IVFModerate evidence
- Oocyte maturation trigger. Human RCTs used kisspeptin-54, the longer form, as an IVF trigger with low rates of ovarian hyperstimulation.
- Hypothalamic amenorrhea. Human pilot studies show restored LH pulsing during infusion; not a home protocol.
Sexual desireEmerging
- Low sexual desire in men and women. Small 2023 RCTs using intravenous infusion showed changes in brain activity and arousal measures; subcutaneous home use is untested.
Axis support on or after TRTWeak or mixed
- Keeping the HPG axis active. Mechanistically plausible but exogenous testosterone feedback blocks most of the effect; no trial data.
- human RCTSubcutaneous kisspeptin-10 in healthy men produced a dose dependent rise in LH and testosterone within 1-3 hours.
- human RCTKisspeptin-54 as an IVF trigger induced oocyte maturation with a low rate of ovarian hyperstimulation syndrome compared to HCG.
- human pilotKisspeptin infusion increased LH pulse frequency and amplitude in women with hypothalamic amenorrhea.
- human RCTKisspeptin administration enhanced brain responses to sexual stimuli and improved arousal measures in men with low sexual desire.
- human pilotContinuous kisspeptin infusion led to receptor desensitization and suppression of gonadotropins in men, reversible after stopping.
Rodent and in vitro mean no human data for that finding. Human pilot means small, often uncontrolled. Human RCT means randomized and controlled. Clinical means an approved drug with regulatory data.
Levels over time
Modeled from the half-life. Illustrative, not measured.A half-life of 4 min against dosing every 24 h means each dose has cleared before the next. Nothing stacks; you start from zero every time, and the tissue effect is what carries over.
The peptide vanishes in minutes but the LH pulse it triggers plays out over hours, so dosing is about spacing pulses rather than maintaining levels, and constant exposure would desensitize the receptor.
Kisspeptin-10 dosage and protocols
Community runs are 4 to 8 weeks with LH and testosterone checked before and after. Because continuous exposure desensitizes KISS1R, protocols favor every other day dosing or a daily dose with regular breaks rather than escalating. No loading or taper.
| Goal | Dose | Frequency | Route |
|---|---|---|---|
| Daily LH support | 50 mcg | once daily | Subcutaneous |
| Receptor sparing | 100 mcg | every other day | Subcutaneous |
| Libido, as needed | 100 mcg | 1 to 2 hours before intimacy, not more than every other day | Subcutaneous |
| Low dose start | 50 mcg | every other day for the first week | Subcutaneous |
Food does not matter. Morning dosing lines up with the natural testosterone peak and makes bloodwork easier to interpret; evening dosing suits people using it for libido. Space doses at least a day apart if any drop in LH or testosterone shows up on labs.
community protocols use 50-100 mcg; research doses are weight based and often much higher
Dose calculator
U-100 insulin syringeUnits are a volume on the syringe, not an amount of peptide. Concentration changes every time you change the water volume. The standalone calculator explains the math.
| Vial | Suggested water | Concentration | Low dose draw |
|---|---|---|---|
| 5 mg | 2 mL | 2.5 mg/mL | 2 units |
| 10 mg | 3 mL | 3.333 mg/mL | 1.5 units |
How to reconstitute Kisspeptin-10
- 1
Wash your hands and wipe the work surface. Swab both vial stoppers with alcohol and let them dry.
- 2
Pick the water volume with the calculator above and write it on the vial. The concentration means nothing without it.
- 3
Draw the bacteriostatic water into a mixing syringe.
- 4
Insert at an angle and let the water run down the inside wall. Never squirt it straight onto the powder.
- 5
Swirl gently or leave it to dissolve. Do not shake.
- 6
Label with the date and water volume. Store in the fridge at 2 to 8 C and use within about 4 weeks.
- 7
Unmixed vials keep for months in the fridge and longer in the freezer, sealed and out of light.
- Full walkthrough with syringe reading and site rotation: reconstitution guide.
- ✓White, fluffy cake
Lyophilized powder should look like a small white puck or fluffy cake at the bottom of the vial. That is a proper freeze-dry.
- ✓Clear after mixing
Once dissolved the solution should be water-clear with nothing floating in it.
- !Slight clumping
Small clumps that dissolve with gentle swirling are fine. Shipping compacts powder.
- ✕Collapsed or melted
Powder stuck to the sides, glassy, or shrunken means it got hot in transit. Contact the vendor.
- ✕Cloudy or particles
Persistent cloudiness or visible particles after mixing means degraded or contaminated product. Do not use it.
- Day 1 to 3
Flushing or a warm feeling and occasional headache after dosing; LH and testosterone rise for a few hours then settle.
- Week 1 to 2
Some people notice higher libido or mood on dosing days; injection site reactions are the main complaint.
- Week 4 to 8
Bloodwork shows whether resting LH and testosterone moved at all; if they dropped, the receptor is desensitizing and the dose should be spaced out.
Interactions and stacking
PT-141synergistic
A hormonal pathway and a central melanocortin pathway combined for sexual desire; no pharmacokinetic conflict.
Melanotan-2compatible
Also acts on melanocortin receptors for libido; watch for nausea and flushing stacking up.
Exogenous testosterone (TRT) or anabolic steroidscaution
Sex steroid feedback at the hypothalamus and pituitary blocks most of the LH response, so the effect is small or absent.
HCGcompatible
Works downstream at the testes rather than upstream, so the two do not compete, but HCG makes kisspeptin largely redundant.
GnRH agonists or antagonistsavoid
These drugs deliberately shut down or override the axis that kisspeptin acts on.
SERMs such as clomiphene or enclomiphenecompatible
Both raise LH through different points in the feedback loop; overlapping use has not been studied.
Opioidscaution
Chronic opioid use suppresses GnRH neurons and blunts the response.
Safety
- ▲Flushing or a warm feeling shortly after injection
- ▲Headache
- ▲Injection site redness or itching
- ▲Mild nausea
- ▲Temporary mood or libido swings on dosing days
- ▲Acne or oily skin if testosterone rises
- ▲Only works with a functioning hypothalamus, pituitary, and gonads; it cannot override testosterone suppression on TRT.
- ▲High or continuous dosing desensitizes the receptor and can lower LH and testosterone.
- ▲Effects on testosterone are modest in healthy men with normal levels; it does not replace TRT.
- ▲Flushing, headache, and injection site reactions are the main reported side effects.
- ▲Long term safety data does not exist; research exposures have been short.
- ■LH or testosterone come back lower than baseline on bloodwork, which signals receptor desensitization
- ■Estrogen related symptoms such as breast tenderness or fluid retention
- ■Severe or persistent headaches
- ■Any hormone sensitive cancer, current or prior
- ■Trying to conceive without medical supervision, since the fertility data is from clinic protocols
Community poll
Self-reported by visitors. Not clinical evidence.Kisspeptin-10: frequently asked
Does kisspeptin-10 raise testosterone?
In healthy men, yes, temporarily. LH rises within an hour and testosterone follows over the next few hours, then everything returns to baseline. Whether repeated dosing produces a sustained increase in resting testosterone has not been shown, and the receptor desensitizes if you push it.
Can I use it instead of HCG on TRT?
Not really. Exogenous testosterone suppresses the axis at the pituitary and hypothalamus, and kisspeptin cannot fully override that feedback. HCG bypasses the problem by acting directly on the testes. Kisspeptin may help keep some upstream signaling alive, but expect it to be weaker.
Does it really improve libido?
Small trials suggest it does, through effects on brain regions involved in sexual processing rather than just through hormones. The studies used intravenous infusions in a lab, so whether a subcutaneous dose at home does the same is an open question. Community reports are mixed.
Why is it called kisspeptin?
The gene was discovered in Hershey, Pennsylvania, and named KISS1 after the Hershey Kiss chocolate, with the SS standing for suppressor sequence because it was first identified as a metastasis suppressor. Its role in reproduction was discovered years later.
References
- Kisspeptin-10 stimulates LH and testosterone secretion in healthy men in a dose dependent manner. Journal of Clinical Endocrinology and Metabolism, 2011
- Efficacy of kisspeptin-54 to trigger oocyte maturation in women at high risk of ovarian hyperstimulation syndrome. Journal of Clinical Endocrinology and Metabolism, 2015
- Kisspeptin modulates sexual and emotional brain processing in men with hypoactive sexual desire disorder. JAMA Network Open, 2023
- Kisspeptin and the control of GnRH secretion in humans. Nature Reviews Endocrinology, 2012