Kisspeptin
Endogenous neuropeptide that activates the HPG axis to naturally stimulate LH, FSH, and testosterone production.
Last updated: May 2026
Category
Hormones / Reproductive
Frequency
Daily or pulsed injection
Research
Clinical / Well-EstablishedWhat is Kisspeptin?
Kisspeptin (also called metastin) is a naturally occurring neuropeptide encoded by the KISS1 gene. It acts on kisspeptin receptors (KISS1R / GPR54) in the hypothalamus to trigger pulsatile release of Gonadotropin-Releasing Hormone (GnRH). This cascade then stimulates the pituitary to release LH (luteinizing hormone) and FSH (follicle-stimulating hormone), which in turn signal the gonads to produce testosterone (in men) and regulate the menstrual cycle and fertility (in women). Browse the full peptide library for related hormone compounds.
Kisspeptin is considered the master regulator of the reproductive HPG axis. Low kisspeptin activity is associated with hypothalamic amenorrhea in women and hypogonadotropic hypogonadism in men: conditions where the hormonal cascade fails to activate properly. Supplemental kisspeptin can reactivate this cascade.
Unlike exogenous testosterone, kisspeptin works by stimulating the body's own hormone production system. This means it can raise testosterone naturally while preserving testicular function and fertility: a key advantage over anabolic steroids or TRT for users who want hormonal optimization without suppressing natural production.
How It Works
KISS1R Activation: Kisspeptin binds to KISS1R receptors on GnRH neurons in the hypothalamus (specifically the arcuate nucleus and anteroventral periventricular nucleus). This triggers pulsatile GnRH secretion.
HPG Axis Stimulation: GnRH pulses reach the anterior pituitary, stimulating LH and FSH release. LH then signals Leydig cells in the testes (or ovarian granulosa cells in women) to produce testosterone (or estrogen/progesterone).
Pulsatile vs Continuous: Kisspeptin is most effective when administered in a pulsatile fashion mimicking natural rhythm, as continuous high-dose administration can paradoxically desensitize receptors and reduce the hormonal response over time.
Benefits
- Natural testosterone elevation without suppressing HPG axis
- Preserves fertility and testicular function (unlike exogenous testosterone)
- May help restore hormonal function after steroid cycles (PCT support)
- Potential treatment for hypogonadotropic hypogonadism
- Improves libido and sexual function
- Studied for female fertility disorders and hypothalamic amenorrhea
- Natural mechanism: body can regulate response through feedback loops
Dosing Protocol
| Phase | Dose | Frequency | Duration |
|---|---|---|---|
| Standard pulse | 3–10mcg/kg | Twice daily (AM + PM, fasted) | 4–8 weeks |
| PCT support | 10–25mcg | Daily | 6–8 weeks post-cycle |
Always start at the lowest effective dose and titrate up gradually.
Side Effects
Common
- ⚠Mild LH surge symptoms (temporary testicular ache)
- ⚠Increased libido (usually welcome)
- ⚠Mild nausea at higher doses
- ⚠Injection site reactions
Rare
- •Temporary hormone fluctuations during first 1–2 weeks
- •Headache
- •Desensitization with continuous high-dose protocols
Who Should NOT Use Kisspeptin
- ✕Hormone-sensitive cancers (prostate, ovarian, breast)
- ✕Active reproductive hormone disorders without medical oversight
- ✕Pregnancy (do not use)
- ✕Under 18 years old
- ✕Women currently trying to conceive should use only under medical supervision (timing is critical)
What to Expect
LH and FSH begin to rise. Some users notice increased libido and morning erections (for men). Testosterone levels begin to elevate: effects are gradual.
Testosterone levels typically approaching their new elevated baseline. Improved energy, mood, and sexual function commonly reported.
Sustained elevated testosterone. Best to blood test at this point to confirm response. Can continue use or cycle off and allow natural axis to maintain.
Notes from Ho Chi Minh City
Kisspeptin is the trickiest peptide in my rotation because dialing in a working pulsatile schedule takes lab work, not vibes. I baselined my LH, FSH, and total testosterone at Diag Lab in District 3 before starting and re-tested at week 4. The pulsatile schedule that worked for me was 100mcg subcutaneous twice daily, morning at 7am and afternoon at 3pm, both fasted. Total testosterone moved from 542 ng/dL to 712 ng/dL over those 4 weeks, with LH rising in proportion which is the main thing I wanted to confirm. The signal that you're overdoing it is when libido suddenly drops mid-cycle, which is desensitization, and the fix is just to back off frequency rather than dose.
FAQ
Q: Can Kisspeptin be used as PCT (post-cycle therapy) after steroids?
A: Yes, Kisspeptin is used in PCT protocols to help restart the HPG axis after steroid-induced suppression. It is often used alongside Clomid or Enclomiphene. The stimulation of endogenous GnRH helps restore natural LH/FSH/testosterone production.
Q: How does Kisspeptin compare to testosterone injections?
A: Exogenous testosterone is faster and more predictable but suppresses natural production and fertility. Kisspeptin is slower-acting but works within the body's natural system, preserving fertility and testicular function. Best for those who want natural hormone optimization rather than TRT.
Q: Should women use Kisspeptin?
A: Kisspeptin has been studied in women with hypothalamic amenorrhea and infertility with promising results. However, timing and dosing are more complex for women due to cycle-dependent hormone regulation. Female use should ideally involve medical oversight. Source from the community-verified supplier list.
Where to Get Kisspeptin in Vietnam
See our community-verified supplier list with COA verification and cold-chain shipping to Vietnam.
Related Peptides
Research & Sources
- Kisspeptin: more than just a reproductive peptide · Hussain MA, Song WJ, Wolfe A · Indian Journal of Endocrinology and Metabolism (2015) PMID: 26693421
Reviews the master-regulator role of kisspeptin in HPG axis activation and clinical implications.
- Kisspeptin restores pulsatile LH secretion in patients with neurokinin B signaling deficiencies · Young J, George JT, Tello JA, et al. · Neuroendocrinology (2013) PMID: 22855317
Demonstrates ability of exogenous kisspeptin to reactivate the HPG axis in hypogonadotropic hypogonadism.
- Kisspeptin-54 stimulates gonadotropin release in healthy men · Dhillo WS, Chaudhri OB, Patterson M, et al. · Journal of Clinical Endocrinology and Metabolism (2005) PMID: 15998777
First-in-human dosing study establishing pharmacokinetics and LH/FSH response curves.
- Kisspeptin and the hypothalamic regulation of reproductive hormone secretion · Skorupskaite K, George JT, Anderson RA · Human Reproduction Update (2014) PMID: 24615662
Comprehensive review of pulsatile vs continuous dosing strategy and downstream LH/FSH/testosterone response.
Important Disclaimer
Educational content only. Not medical advice. Peptides discussed on this page are not approved by Vietnam’s Ministry of Health (Bộ Y Tế) or the Drug Administration of Vietnam (DAV) for the indications described. Research peptides are not stocked at Long Châu, Pharmacity, or any retail pharmacy in Vietnam. Consult a licensed physician before any use.