---
title: "Kisspeptin: what sources report"
url: https://humanpeptides.fyi/peptides/kisspeptin
site: humanpeptides.fyi
last_reviewed: 2026-10-11
---
# Kisspeptin
> humanpeptides.fyi makes no claims of its own. Every statement below reports what a cited source says, with its link. Not medical advice.
Kisspeptin: Hypothalamic neuropeptide (KISS1 gene product; kisspeptin-10 is the shortest active fragment) that activates GPR54/KISS1R on GnRH neurons, driving LH/FSH and sex-steroid release. The sources cited here most often discuss it for: LH and testosterone rise; Desire and arousal; Safer IVF trigger. Evidence label: Early human.
## At a glance
- **Type:** Peptide
- **Family:** Sexual Health & Hormones
- **Evidence label:** Early human (3 of 5)
- **Regulatory status:** Since September 2023 kisspeptin-10 has been on FDA's 503A Category 2 list of bulk substances that may present significant safety risks in compounding, with FDA citing possible immunogenicity and too little safety information to know whether it would harm people.
- **Goals discussed:** Hormones & Fertility, Libido & Sexual Health, Calm & Mood
- **Also called:** kisspeptin-10, kisspeptin-54, KP-54, metastin
- **Last reviewed:** 2026-10-11
## What is Kisspeptin?
- Hypothalamic neuropeptide (KISS1 gene product; kisspeptin-10 is the shortest active fragment) that activates GPR54/KISS1R on GnRH neurons, driving LH/FSH and sex-steroid release; investigational, not FDA-approved. Sources:
**Regulatory status:** Since September 2023 kisspeptin-10 has been on FDA's 503A Category 2 list of bulk substances that may present significant safety risks in compounding, with FDA citing possible immunogenicity and too little safety information to know whether it would harm people. Source:
## What is Kisspeptin researched for?
### 1. LH and testosterone rise
- Potently stimulates LH and raises testosterone in men: continuous kisspeptin-10 infusion increased LH pulse frequency and testosterone from 16.6 to 24.0 nmol/L (human study) Sources: ,
- Goals: [Hormones & Fertility](https://humanpeptides.fyi/objectives/hormones)
### 2. Desire and arousal
- Enhances sexual desire/arousal brain processing; in men with HSDD, kisspeptin-54 increased sexual brain activity, penile tumescence and desire (human fMRI RCTs) Sources: , ,
- Goals: [Libido & Sexual Health](https://humanpeptides.fyi/objectives/libido), [Calm & Mood](https://humanpeptides.fyi/objectives/mood)
### 3. Safer IVF trigger
- Safer IVF trigger: kisspeptin-54 triggered oocyte maturation in women at high OHSS risk with no moderate/severe OHSS (phase 2 human RCTs) Sources: , ,
- Goals: [Hormones & Fertility](https://humanpeptides.fyi/objectives/hormones)
## What do researchers and users say about Kisspeptin?
> "These data suggest that kisspeptin has potential as the first pharmacological treatment for men with low sexual desire."
>
> Mills EG, et al., Effects of Kisspeptin on Sexual Brain Processing and Penile Tumescence in Men With Hypoactive Sexual Desire Disorder: A Randomized Clinical Trial.
Context: Crossover placebo-controlled trial of intravenous kisspeptin-54 in 32 men with hypoactive sexual desire disorder (JAMA Netw Open, 2023).
> "Compounded drugs containing Kisspeptin-10 may pose risk for immunogenicity for certain routes of administration and may have complexities with regard to peptide-related impurities and API characterization."
>
> US Food and Drug Administration, Certain Bulk Drug Substances for Use in Compounding that May Present Significant Safety Risks.
Context: FDA's stated reason for placing kisspeptin-10 in 503A Category 2 (September 29, 2023).
> "I do also consider placebo to have SOME portion of the benefits, but this is the first time I can say that I am pretty sure that this is not placebo, it's too big of a difference and too obvious."
>
> Anonymous user, r/PSSD, After 11 Years of PSSD, Kisspeptin-10 is the first thing that helps me. (HELPS, not completely reverses PSSD).
Context: Unverified self-report on sexual side effects after SSRI use; the poster later reported worse sleep and another commenter saw no improvement.
## What side effects of Kisspeptin are reported?
- Generally well tolerated in short human studies Sources:
- Users report elevated estradiol, sleep problems, heavy legs, emotional symptoms at self-selected daily amounts (anecdotal) Sources:
- FDA flags possible immune reactions (immunogenicity) and impurity problems with compounded kisspeptin-10 and says it lacks enough data to know whether it causes harm. (regulator statement) Sources:
- Transient flushing and a feeling of warmth are listed as possible effects. (practitioner reference) Sources:
- A user described feeling like they crashed after stopping it. (anecdotal) Sources:
## What do peptide guides say about Kisspeptin?
- **PepEdHub:** PepEdHub describes kisspeptin as the master switch of the reproductive hormone axis, acting on hypothalamic GPR54 receptors to release GnRH, with separate direct effects on sexual arousal.
- **Seek Peptides:** Seek Peptides lists kisspeptin for fertility, hormone regulation and libido, but labels it a newer, experimental peptide with limited data.
- **PubMed:** In 32 men with low sexual desire, a kisspeptin infusion increased penile tumescence to sexual videos by up to 56% more than placebo and raised self-rated happiness about sex.
## What does the research say, system by system?
### Body & tissues
- Users report increased testicular size (anecdotal Reddit) Sources:
- Ovary: triggers oocyte maturation (human trials) Sources:
### Hormones & physiology
- Raises LH, FSH and testosterone via GnRH; effects sexually dimorphic (weaker in women outside preovulatory phase) (human) Sources:
- Continuous high exposure can desensitize; intermittent dosing sustains response (human, per summary) Sources:
### Brain, mood & sleep
- Enhances limbic responses to sexual and bonding stimuli and reduces negative mood in men (human fMRI) Sources:
- Some users report sleep problems and emotional symptoms at higher daily doses (anecdotal) Sources:
### Also notable
- Users with PSSD/post-finasteride syndrome report partial improvement in libido, erections, orgasm (anecdotal Reddit) Sources: ,
- Little effect reported when used alongside TRT (anecdotal) Sources:
## How strong is the evidence for Kisspeptin?
**Early human** (3 of 5). Short-term human physiology studies and phase 2 IVF trials; not approved; self-use anecdotal
_Small, short, old, unblinded or single-group human studies._
## Questions about Kisspeptin
### What is Kisspeptin?
Hypothalamic neuropeptide (KISS1 gene product; kisspeptin-10 is the shortest active fragment) that activates GPR54/KISS1R on GnRH neurons, driving LH/FSH and sex-steroid release.
### Is Kisspeptin FDA-approved?
Since September 2023 kisspeptin-10 has been on FDA's 503A Category 2 list of bulk substances that may present significant safety risks in compounding, with FDA citing possible immunogenicity and too little safety information to know whether it would harm people.
### What is Kisspeptin researched for?
The sources cited on this page most often discuss three outcomes: LH and testosterone rise; Desire and arousal; Safer IVF trigger. Each line above shows what the source reports and how strong that evidence is.
### What side effects of Kisspeptin are reported?
Reported in the cited sources: Generally well tolerated in short human studies; Users report elevated estradiol, sleep problems, heavy legs, emotional symptoms at self-selected daily amounts; FDA flags possible immune reactions (immunogenicity) and impurity problems with compounded kisspeptin-10 and says it lacks enough data to know whether it causes harm. The list is not complete, and few listed risks does not mean a compound is safe.
### How strong is the evidence for Kisspeptin?
Evidence label: Early human. Short-term human physiology studies and phase 2 IVF trials; not approved; self-use anecdotal.
### What else is Kisspeptin called?
Names used for it include kisspeptin-10, kisspeptin-54, KP-54, metastin.
### Does humanpeptides.fyi recommend Kisspeptin?
No. humanpeptides.fyi makes no claims and no recommendations of its own. It summarizes and links to what others have published and posted. Nothing here is medical advice; talk to a licensed clinician.
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