Kisspeptin-10
⚠️ Structural Separation Notice
The Ageless Pep Academy is a clinical education property independent from any commerce operation. Any references in this profile to Ageless Peps product SKUs, pricing, or the agelesspeps.com domain are for completeness and transparency; they are not endorsements and do not form part of the clinical education content. Clinicians are responsible for independent verification of any product sourcing decision. The Academy's Medical Director provides editorial oversight only and does not endorse commercial products.
Truncated kisspeptin fragment — KISS1R agonist and master regulator of the hypothalamic-pituitary-gonadal (HPG) axis via pulsatile GnRH release.
Quick Facts
| Property | Value |
|---|---|
| Also Known As | KP-10, Metastin 45-54, Metastin fragment |
| Category | Sexual Health / Reproductive |
| Sequence | Tyr-Asn-Trp-Asn-Ser-Phe-Gly-Leu-Arg-Phe-NH2 (C-terminal decapeptide of kisspeptin-54) |
| Molecular Weight | ~1302 Da |
| Molecular Formula | C63H83N17O14 |
| PubChem CID | 25081702 |
| Administration | SubQ / IV |
| Typical Dose Range | 1-10 nmol/kg IV bolus (clinical trials); 50-100 mcg SubQ (off-label) |
| Half-Life | ~28 min (KP-10 IV); ~55 min (KP-54 IV) |
| Storage | Lyophilized: -20C for 1-2 years. Reconstituted: 2-8C, use within 1-2 weeks |
| FDA Status | Research only — not approved for any indication |
| WADA Status | Prohibited (S0 — Non-Approved Substances) |
Mechanism of Action
Kisspeptin-10 is the most potent bioactive fragment of the kisspeptin family, retaining the full receptor-activating C-terminal RF-amide motif of the parent kisspeptin-54 peptide. It acts as a potent agonist of the KISS1R receptor (formerly GPR54) expressed on gonadotropin-releasing hormone (GnRH) neurons in the arcuate nucleus and anteroventral periventricular nucleus of the hypothalamus (PMID: 34210598).
KISS1R activation triggers a Gq/11-coupled signaling cascade (PLC-beta –> IP3 –> intracellular calcium mobilization) that depolarizes GnRH neurons and stimulates pulsatile GnRH release into the hypophyseal portal circulation. This pulsatile GnRH pattern is critical: it drives physiological LH and FSH secretion from anterior pituitary gonadotrophs, which in turn stimulates gonadal steroidogenesis (testosterone in males, estradiol/progesterone in females) and gametogenesis. Unlike synthetic GnRH agonists (leuprolide, goserelin) that cause receptor desensitization and paradoxical gonadal suppression with continuous administration, kisspeptin works one step upstream and preserves the pulsatile pattern that maintains reproductive function (PMID: 36287566).
Beyond its reproductive endocrine role, kisspeptin also modulates sexual brain processing. Functional MRI studies by the Dhillo group at Imperial College London have demonstrated that kisspeptin administration enhances neural activity in limbic and paralimbic brain regions (amygdala, cingulate cortex, thalamus) in response to sexual and romantic stimuli, suggesting a direct role in sexual arousal and attraction independent of its hormonal effects (PMID: 36735255).
Kisspeptin neurons (KNDy neurons) co-express neurokinin B and dynorphin, forming an auto-regulatory oscillatory network that generates the GnRH pulse generator. KP-10 administration effectively amplifies this endogenous pulse, making it a physiological tool rather than a pharmacological override of the HPG axis.
Key Research Areas
-
IVF and Assisted Reproduction: Kisspeptin-54 has been investigated as an alternative to hCG for triggering final oocyte maturation in IVF cycles, with a significantly lower risk of ovarian hyperstimulation syndrome (OHSS). Abbara et al. demonstrated successful oocyte maturation and live births using kisspeptin-54 as a trigger in women at high OHSS risk (PMID: 33196464).
-
Female Hypoactive Sexual Desire Disorder (HSDD): The Dhillo group showed that kisspeptin administration enhanced sexual brain processing and increased penile tumescence and sexual desire in both women with low sexual desire (PMID: 36287566) and healthy men (PMID: 36735255).
-
Hypothalamic Amenorrhea: Kisspeptin restores pulsatile GnRH/LH secretion in women with hypothalamic amenorrhea (stress-related, exercise-induced, or low body weight), offering a potential non-desensitizing therapeutic approach to restore menstrual cyclicity.
-
Male Hypogonadism: KP-10 stimulates robust LH and testosterone surges in hypogonadotropic men, providing a physiological alternative to exogenous testosterone replacement that preserves spermatogenesis and endogenous HPG axis function.
-
Puberty and Reproductive Development: Kisspeptin signaling is the gatekeeper of pubertal onset; loss-of-function KISS1R mutations cause isolated hypogonadotropic hypogonadism. Clinical research explores kisspeptin for diagnostic assessment of pubertal readiness.
-
Sexual Brain Processing (fMRI studies): Functional neuroimaging has revealed that kisspeptin enhances brain activity in regions associated with sexual arousal, emotional processing, and reward, establishing kisspeptin as a neuromodulator of sexual behavior beyond its endocrine role.
Evidence Level Summary
| Evidence Type | Count | Notes |
|---|---|---|
| Human RCTs | 2 | IVF trigger trials, dose-ranging LH response studies |
| Human observational | 3 | fMRI sexual brain processing studies, LH pulsatility characterization |
| Animal in vivo | 1 | KNDy neuron GnRH pulse generator models |
| In vitro | 1 | KISS1R signaling and receptor binding studies |
| Systematic reviews | 1 | Clinical potential of kisspeptin in reproductive health |
Clinical Applications
- Sexual Health — Enhances sexual brain processing and desire via limbic modulation
- Fertility — IVF trigger alternative with lower OHSS risk; restores LH pulsatility
- Libido Enhancement — Direct neuromodulation of arousal pathways independent of hormones
- Erectile Dysfunction — LH/testosterone stimulation in hypogonadotropic men
Protocols Using This Peptide
Ageless Peps Products
- AP-kisspeptin-10-vial — Kisspeptin-10 Vial, SubQ/IV, $64 (WC ID: 694)
Dosing Reference
Research Dosing Ranges (from literature)
| Route | Dose Range | Frequency | Duration | Source |
|---|---|---|---|---|
| IV bolus | 1-10 nmol/kg | Single dose or pulsatile (q90-120 min) | Acute (fertility protocols) | PMID: 33196464 |
| IV infusion | 0.1-1.0 nmol/kg/h | Continuous | 8-24 hours | Dhillo group trials |
| SubQ | 50-100 mcg | Single dose or pulsatile | Varies by indication | Off-label clinical practice |
Cycling
Kisspeptin-10 dosing depends on clinical goal. For fertility (IVF trigger), single or short-term pulsatile administration is used. For sexual health or hormonal support, intermittent dosing (2-3 times per week) is practiced off-label. Chronic daily administration has not been extensively studied but the physiological pulsatile mechanism suggests desensitization risk is lower than with GnRH agonists. Practitioners typically cycle 4 weeks on / 2 weeks off for ongoing HPG axis support.
Contraindications & Safety
- Contraindications: Hormone-sensitive malignancies (breast, prostate, endometrial — LH/testosterone/estrogen stimulation contraindicated); active pregnancy (theoretical risk of hormonal disruption); PCOS (use with caution — may exacerbate hyperandrogenism)
- Common side effects: Mild facial flushing (transient), nausea at higher IV doses, injection site discomfort. Clinical trial safety profile is excellent with no serious adverse events reported across multiple human studies.
- Drug interactions: GnRH agonists/antagonists (pharmacological conflict); hormonal contraceptives (may reduce efficacy); clomiphene (additive HPG stimulation — monitor)
- Pregnancy/nursing: Contraindicated for ongoing use. Used only as acute IVF trigger under direct clinical supervision.
- Special populations: Pediatric — diagnostic use only for pubertal assessment. Geriatric — limited data. Renal/hepatic impairment — no specific data; kisspeptin is rapidly cleared by endopeptidases.
Synergistic Combinations
- PT-141 + Kisspeptin-10 — PT-141 activates central desire (MC4R/dopamine) while kisspeptin drives upstream HPG hormonal support; complementary mechanisms for sexual dysfunction
- Oxytocin + Kisspeptin-10 — Oxytocin enhances bonding and intimacy; kisspeptin drives reproductive hormone surges and sexual brain activation
- Gonadorelin + Kisspeptin-10 — Both stimulate the HPG axis but at different levels (GnRH receptor vs. GnRH neuron); kisspeptin preserves pulsatility while gonadorelin provides direct gonadotroph stimulation
Related Research
| PMID | Title | Year | Study Type |
|---|---|---|---|
| PMID-34210598 – Clinical Potential of Kisspeptin in Reproductive Health | Clinical Potential of Kisspeptin in Reproductive Health | 2021 | Systematic Review |
| PMID-36287566 – Kisspeptin and Sexual Brain Processing in Women | Kisspeptin enhances brain responses to sexual and emotional stimuli in women with HSDD | 2023 | Observational (fMRI) |
| PMID-36735255 – Kisspeptin Sexual Brain Processing in Men | Kisspeptin modulates sexual and emotional brain processing in men | 2023 | Observational (fMRI) |
| PMID-33196464 – Kisspeptin as IVF Trigger | Kisspeptin-54 triggers oocyte maturation in women at high risk of OHSS | 2020 | RCT |
| PMID-39813600 – Kisspeptin and Neurokinin B in Reproductive Health | Kisspeptin and neurokinin B: roles in reproductive health | 2024 | Review |
| PMID-31399145 – Kisspeptin KISS1R Systems in the Periphery | Reproductive functions of Kisspeptin/KISS1R Systems in the Periphery | 2019 | Review |
| PMID-38861336 – Kisspeptin Signaling in Astrocytes | Kisspeptin signaling in astrocytes modulates the reproductive axis | 2024 | Animal in vivo |
| PMID-33045946 – Kisspeptin Regulation of Reproductive and Immune Reactions | Role of Kisspeptin in Regulation of Reproductive and Immune Reactions | 2020 | Review |
References
- PMID: 34210598 — Abbara A, et al. Clinical potential of kisspeptin in reproductive health. Trends Mol Med. 2021.
- PMID: 36287566 — Comninos AN, et al. Kisspeptin modulates sexual and emotional brain processing in women with hypoactive sexual desire disorder. J Clin Invest. 2023.
- PMID: 36735255 — Comninos AN, et al. Kisspeptin modulates sexual and emotional brain processing in men. J Clin Invest. 2023.
- PMID: 33196464 — Abbara A, et al. Kisspeptin-54 as a novel IVF trigger. Lancet Diabetes Endocrinol. 2020.
- PMID: 39813600, 31399145, 38861336, 33045946.
Related
#peptide #sexual-health #reproductive #subq #iv