Kisspeptin-10: the switch above the axis, and why continuous dosing turns it off
One level above everything else that acts on the testosterone axis. It also has the most counterintuitive property in this reference: administered wrongly it does the exact opposite of what it is taken for.
Regulatory status. Research compound — no FDA approval for testosterone restoration. Used in fertility research. That is the app’s own field, reproduced here rather than summarised. It means no regulator has reviewed a manufacturer’s evidence for identity, purity, potency or safety in people for this compound, so nothing below is a marketing claim about a product you can buy.
Purity, identity and concentration are therefore unverified by anyone but whoever made the vial. The storage rule in the fact box below is general practice for this formulation rather than a specification for a particular product: General handling practice for this formulation. Your supplier’s own insert or COA overrides anything here.
This page names no vendor, no clinic and no testing service, and there is no discount code anywhere on this site — the moment a page like this recommends where to buy, it stops being information.
- Also known as
- Metastin, KP-10
- Class
- Peptide
- Regulatory status
- Research compound — no FDA approval for testosterone restoration. Used in fertility research.
- Modelled half-life
- 6 min — estimated half-life, limited human PK data
- Time to peak
- 3 min
- Formulation
- Aqueous (reconstituted powder)
- Before mixing
- Sealed powder tolerates room temperature in transit, but keep it refrigerated at 2–8 °C (36–46 °F) for anything beyond a few weeks, or frozen for months. Keep it dark — the carton it shipped in is doing a job.
- After mixing
- Once reconstituted with bacteriostatic water: refrigerate at 2–8 °C and use within about 28 days. The benzyl alcohol in bacteriostatic water is what buys that window — plain sterile water has no preservative, so a vial mixed with it should be treated as one sitting only. Kits are usually ten vials: only the one you mixed is on that 28-day clock — the sealed ones keep their own, much longer shelf life, so store them as powder, not as solution.
- What ruins it
- Do not freeze a reconstituted vial. Repeated freeze–thaw is one of the more reliable ways to degrade a peptide.
- Handling caveat
- General handling practice for this formulation. Your supplier’s own insert or COA overrides anything here.
Upstream of the whole axis
Established clinical use The hypothalamic-pituitary-gonadal axis is usually drawn starting at GnRH. Kisspeptin sits above it: kisspeptin neurons drive the GnRH pulse generator, and loss-of-function mutations in the kisspeptin receptor cause failure of puberty. That finding, in the mid-2000s, is what established it as the master regulator of reproduction rather than a modulator of it.
Kisspeptin-10 is the C-terminal decapeptide fragment that retains receptor activity. Administered to a person, it triggers GnRH release, which triggers luteinising hormone, which triggers testosterone — an intact chain that only works if every link below it works. The LH and FSH page covers how the state of that chain is established before anything is given.
The property that makes it easy to get exactly wrong
Established clinical use The GnRH system responds to pulses and shuts down under continuous stimulation. This is not a subtlety — it is the basis of an entire drug class: continuous GnRH agonists are used clinically to suppress testosterone in prostate cancer, and they work by desensitising the very receptors they stimulate. The same logic runs one level up.
So kisspeptin given in properly spaced pulses raises testosterone, and kisspeptin given continuously or too frequently desensitises the axis and lowers it. The app’s own drawbacks list says this in capitals, and it is right to. It is the only compound in this reference where getting the schedule wrong does not merely reduce the effect but reverses it.
That is also why the app puts an LH surge thirty to sixty minutes after an injection on the monitoring list. It is a direct test of whether the receptor is still responding, and it is the closest thing available to a real-time check that the protocol is doing what it is supposed to.
What the research actually covers
Off-label or community practice Kisspeptin has been studied seriously in humans, mostly in reproductive endocrinology: as a trigger for oocyte maturation in fertility treatment, in investigations of hypothalamic amenorrhoea, and in studies of the axis itself. It is genuine clinical research, and none of it is a trial of sustained testosterone restoration in men. The app’s regulatory string says exactly that.
The app models a very short half-life and flags it as an estimate, consistent with a small peptide cleared quickly. The practical difficulty follows: a compound that must be delivered in properly separated pulses, with a very short half-life, on a schedule nobody has established, is one where the margin for getting it wrong is narrow and the failure mode is suppression.
There is no approved product for this use. Identity and purity rest with whoever made the vial, and this site names no vendor. Anyone considering it for hypogonadism should know that enclomiphene and hCG address the same axis with far more human data behind them, and that which if any is appropriate is a prescribing decision.
How long one dose lasts
pkCurve function.
The vertical axis is relative: the shape carries across people, the absolute
concentration does not. This compound’s half-life is flagged as an estimate in the app, so read the curve as the right shape rather than the right numbers.Try other intervals on the half-life and steady-state calculator, which runs the same function against whatever cadence you type.
The dosing rows the app records
Animal-only or theoretical Reproduced from the app’s reference so you can see what it holds, not as a recommendation. Which row applies to a particular person, if any, is a clinical decision this page does not make — and rows describing supraphysiological or post-cycle use are filtered out before this table is built, so what you see here is a subset.
| Label | Amount | Route and frequency | Duration recorded |
|---|---|---|---|
| HPG Axis Restoration | 1-2mg | SubQ pulsatile — 2-3x daily with 8+ hour gaps | 4-8 weeks |
| Libido and Sexual | 1mg | SubQ 30-60 min before activity | As needed |
What the app monitors alongside it
The panel below is the app’s own monitoring note for Kisspeptin-10, verbatim. The analytes in it that have a page here are linked; those pages cover what each one measures, which assay produced it and how to read a trend.
- Monitoring panel
- Total T, LH, FSH, E2 every 4 weeks. LH surge 30-60 min post-injection confirms receptor response.
Drawbacks and risks the app records
From the app’s own entry, and the last item is the one to read twice: continuous dosing suppresses the axis rather than stimulating it.
- Pulsatile dosing is complex and critical — continuous dosing causes desensitization
- Limited clinical trial data outside fertility research
- Injection only
- Not FDA approved for testosterone restoration
- Mechanism complex — easy to misuse
- Continuous dosing SUPPRESSES the axis — timing is critical
Interaction rules that name Kisspeptin-10
From the app’s interaction data, filtered so no rule naming a compound this site does not publish appears. Not exhaustive, and not a safety clearance: a combination that is not listed is one nobody has documented here, which is not the same as one that is fine. The combination checker has the rest.
Synergistic HPG Axis Restoration
Kisspeptin-10 acts upstream of GnRH while Clomid acts at the hypothalamic estrogen receptor — together they stimulate the HPG axis at multiple points. This combination may be more effective than either alone for secondary hypogonadism recovery.
What to watch: Total T, LH, FSH, E2 every 4 weeks. LH surge post-Kisspeptin confirms receptor function.
Questions people actually ask
Why does continuous dosing suppress testosterone?
Because the GnRH system responds to pulses and desensitises under constant stimulation. That is the same mechanism continuous GnRH agonists use clinically to suppress testosterone in prostate cancer. Kisspeptin sits one level above and behaves the same way.
How would I know it is working?
An LH surge thirty to sixty minutes after an injection, which is the app’s own monitoring suggestion and is a direct test that the receptor is still responding.
Has it been studied for raising testosterone?
Not as a sustained restoration therapy. The human research is reproductive endocrinology — fertility treatment, hypothalamic amenorrhoea, axis physiology — which is real research about a different question.
How does it compare to enclomiphene or hCG?
Both act on the same axis with substantially more human data: enclomiphene at the hypothalamic oestrogen receptor, hCG at the LH receptor on the testis. Kisspeptin acts above both and has the least evidence for this use.
Where the load-bearing numbers come from
Named rather than linked. Publisher URLs move, and a citation that resolves to a 404 two years from now is worse than one you can search for by name — every entry below is findable from the title and year alone.
- Kisspeptin as the upstream regulator of GnRH
- Established by loss-of-function mutation findings in the mid-2000s and the subsequent literature
- Desensitisation under continuous stimulation
- The same pharmacology that underlies continuous GnRH agonist therapy for androgen suppression
- Human research context
- Reproductive endocrinology studies including oocyte maturation triggering; not sustained testosterone restoration
- Estimated half-life
- app.html’s TL_PK entry, flagged est: limited or absent human pharmacokinetic data
A compound where the interval between doses decides the direction of the effect is one to log precisely. TherapyLog records the time, not just the day.
Save this dose to your log