Kisspeptin-10
A shot that tells your own body to make more sex hormones, used mostly by women for libido and low hormones. Does little for men on TRT.
What it is
Kisspeptin-10 flips the switch at the very top of your hormone chain, so your brain sends the signal that leads to your own testosterone and estrogen. Women with flat libido and low hormones are the main users; it turns the system up rather than replacing anything.
Who uses it: women in their late 30s to 50s whose desire has faded along with their hormones and who do not want to go straight to hormone replacement; women coming off years of hormonal birth control whose own cycle is slow to restart; and men with low-normal testosterone who want to raise their own output before considering TRT. It is a ten-amino-acid piece of kisspeptin, the signal that sits above GnRH, which sits above LH and FSH, which drive the ovaries and testes. Because it works at the top, it only turns up what your body is willing to make.
What you notice: for some people, the first shot brings a few hours of heightened interest, flushing and warmth, which fits the brain-imaging studies showing stronger responses to romantic and sexual cues after a dose. The hormone effect is slower; women report better mood, more natural lubrication and more interest over three to six weeks, and men see a modest testosterone bump on labs rather than anything they feel. What it will not do: override suppression. A man on testosterone injections has a shut-down signal chain, and kisspeptin cannot talk over that. A woman on the pill is in the same position.
How people run it: 200 mcg subQ to start, 350 mcg as the usual dose, 500 mcg at most, three or four times a week and never daily for weeks. The reason for days off is the one practical thing to know: kisspeptin given continuously switches the system off instead of on, which is exactly how it is used in some medical settings to suppress hormones. Intermittent is the whole game. The days off each week, not a long break, are what keep it working, so it can run ongoing. A 10 mg vial is nearly 30 doses at 350 mcg, so a vial is a couple of months. Morning or evening does not matter much; some women time it to the first half of the cycle. The common mistakes are daily dosing, expecting a drug-like libido hit every time, and running it on top of TRT or the pill.
Evidence: this is a research-active area, mostly from one group in London. Human studies show a shot raises LH within an hour and testosterone in men over the following hours; kisspeptin has been used to trigger egg maturation in IVF; and small imaging studies show stronger brain responses to sexual and romantic images, with men reporting more sexual arousal. All of that is real, and all of it is small studies in the range of a few dozen people. There is no trial of kisspeptin-10 as a libido treatment, and the long-term picture is unknown. Not approved anywhere.
Skip it if you are on TRT, on hormonal birth control, pregnant, or have a hormone-sensitive cancer. If the problem is desire in the moment rather than hormones, PT-141 is the direct answer, and a man on TRT who wants to keep his testes working should look at hCG or Gonadorelin, which act one step down the chain and are not blocked by the testosterone. If you want a very gentle hormone nudge and are patient, this is a fair place to start; if you want something you can feel every time, it is not.
What people use it for
Reproductive hormones
Some evidenceHuman studies show a single dose raises LH within about an hour and testosterone over the next several hours in men, and raises LH in women depending on cycle phase. Kisspeptin has been used to trigger egg maturation in IVF. These are small, careful studies that prove the mechanism, not a treatment.
Libido and arousal
Early daysSmall brain-imaging studies in healthy men found stronger responses to sexual and romantic images and more self-reported arousal after a dose. The effect was measurable but modest, and nobody has run a trial of kisspeptin-10 for low libido. User reports in women are consistent but anecdotal.
Continuous dosing shuts it off
Some evidenceGiven continuously, kisspeptin desensitizes the system and hormone output falls, which is how it has been used experimentally to suppress hormones. This is well established and is the reason dosing must be intermittent. Daily use for weeks is the way to make it stop working.
How it works
- Used for libido and hormone support
- Signals your body to make its own reproductive hormones
- Early in human research
- Promising for a natural hormone nudge, but not well established
How people use it
Safety, in brief
Things people sometimes notice
- A warm flush and a few hours of heightened interest after a shot
- A small sting or redness at the injection site
- A shift in cycle timing in women during the first month
- Nothing you can feel, which is common; the change is on labs
The full picture — stop signs and who should talk to a doctor first — is on the dosing guide.
Sources
The labels and studies behind this page. Each link opens the original on PubMed, DailyMed or ClinicalTrials.gov.
- Kisspeptin-10 is a potent stimulator of LH and increases pulse frequency in men
- Kisspeptin administration to women: a window into endogenous kisspeptin secretion and GnRH responsiveness across the menstrual cycle
- Chronic subcutaneous kisspeptin-10 stimulates gonadotropin secretion for 12 days in healthy men