Kisspeptin‑10
10-amino-acid C-terminal kisspeptin fragment – hypothalamic GPR54 → GnRH pulse → LH/FSH. Highest-upstream HPG axis restart agent. Imperial College London Phase I-II ongoing in 2020s; research-emerging.
WHAT IS KISSPEPTIN-10?
Detailed overview
Kisspeptin-10 is the 10-amino-acid C-terminal bioactive fragment of the kisspeptin family (KISS1 gene-product) that binds to the hypothalamic GPR54 (also known as KISS1R) receptor, triggering a GnRH-pulse pattern on arcuate-nucleus GnRH neurons – thereby triggering pituitary LH/FSH release, which activates Leydig cell testosterone production. Kisspeptin-10 is the highest upstream axis-restart agent in the AAS-PCT arsenal: the classical PCT tools (Nolvadex, Clomid SERMs) work on pituitary ER blockade (1-level downstream), HCG directly stimulates the testicular Leydig cell LHCGR receptor (3-level downstream), BUT Kisspeptin-10 restarts the hypothalamic GnRH-pulsatility pattern – which is the foundation of the entire physiological functioning of the HPG axis. Jayasena 2017 (PMID 27959703) Phase I-II trial documented that significant LH/FSH spikes + Total Test elevation are achievable 1-2 hours after SC injection. Imperial College London (Waljit Dhillo lab) is currently conducting ongoing Phase II trials in hypogonadism + IVF-fertility indications. Research-emerging state: NO approved commercial pharmaceutical exists (Adlumiz pipeline emerging 2025+); UGL peptide-CDMO sourcing is the standard. Practical problem: pulsatile-dosing is impractical in a self-administration context (90-min cycles, pump-protocol required), bolus-dose has limited efficacy.
Mechanism
Hypothalamic GPR54 (KISS1R) agonist → GnRH-pulse → LH/FSH → testicular Test
Dosing
50-200 mcg SC every 90 min (pulse-pump) or 1-2 mg SC bolus daily (community protocol, limited efficacy)
Half-life
~28 minutes (very short – pulsatility pattern is essential)
Onset
LH/FSH spike 1-2 hours after SC
Legal status
NO FDA/EMA pharmaceutical approval; Imperial College London Phase II ongoing 2026, WADA S2 Peptide Hormones banned
Data console
Lab data
Safety
Side effects, stop signs, contraindications
Side effects · 7
- Transient LH/FSH and testosterone surge: rapid hormonal swings that may cause headache, mood lability and short-term libido changes, as documented in clinical trials.
- Receptor desensitization with continuous, non-pulsatile dosing: chronic steady GPR54/GnRH stimulation can paradoxically downregulate the axis and cause LH suppression (the known mechanism of GnRH-agonist therapy).
- Injection-site reactions: subcutaneous administration can cause redness, pain, itching or swelling at the site; this accumulates with frequent daily/hourly dosing.
- Sterility and infection risk: self-handling of research-grade lyophilized peptide (reconstitution, frequent SC injection) can cause skin and soft-tissue infection with non-sterile technique.
- Secondary estradiol rise: peripheral aromatization of the induced testosterone can raise E2, potentially causing water retention or tenderness, of similar magnitude to the HCG axis.
- Fertility/reproductive neuroendocrine effects: kisspeptin strongly drives the reproductive axis, so uncontrolled dosing can disrupt natural cyclicity and spermatogenesis; long-term human safety data are limited.
- Peptide quality risk: UGL sources without HPLC/mass-spec certification may contain degraded or pseudo-peptide, leading to ineffectiveness or unpredictable reactions.
Contraindications · 7
- Pregnancy and breastfeeding, plus pregnant-partner contact risk: kisspeptin is central to reproductive neuroendocrine regulation; avoid due to theoretical fetal HPG-axis effects.
- Hormone-sensitive (androgen- or estrogen-dependent) cancer, e.g. prostate or breast cancer: the induced LH/FSH and testosterone rise can worsen the disease.
- Concurrent GnRH-agonist therapy (Lupron, Zoladex) or other GnRH-pathway agents (gonadorelin): not recommended due to overlapping mechanism and theoretical receptor interaction.
- Structural hypothalamic-pituitary damage or pituitary insufficiency: a peptide acting at the top of the axis cannot substitute downstream replacement where the pituitary response is absent.
- Known hypersensitivity to kisspeptin or formulation excipients (e.g. bacteriostatic water, benzyl alcohol).
- Competitive athletes: prohibited both in- and out-of-competition under WADA S2 Peptide Hormones.
- Untrained self-administering user: the pulsatile pump protocol and sterile reconstitution/injection technique require specialized knowledge; contraindicated without it.
Related Performance Compounds
Same therapeutic category
Studies
Related research and clinical findings
Age-dependent changes in the reproductive axis responsiveness to kisspeptin-10 administration in healthy men.
Ullah H, Nabi G, Zubair H, Shahab M
Changes in the Responsiveness of the Hypothalamic-Pituitary-Gonadal Axis to Kisspeptin-10 Administration during Pubertal Transition in Boys.
Nabi G, Ullah H, Khan S, Wahab F, Duan P, Ullah R, Shireen N, Shahab M
Hypothalamic Response to Kisspeptin-54 and Pituitary Response to Gonadotropin-Releasing Hormone Are Preserved in Healthy Older Men.
Abbara A, Narayanaswamy S, Izzi-Engbeaya C, Comninos AN, Clarke SA, Malik Z, Papadopoulou D, Modi M, Faruqi D, Mustafa R, Bassett P, Lavery S, Trew GH, Patel A, Hu M, Bloom SR, Dhillo WS
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