Kisspeptin
Kisspeptin-10
Kisspeptin (Kisspeptin-10) is a neuropeptide derived from the KISS1 gene, primarily recognized as a master regulator of the hypothalamic-pituitary-gonadal (HPG) axis. It is used in clinical research and increasingly in performance contexts to stimulate endogenous LH and FSH secretion, with applications in fertility treatment, hypogonadism evaluation, and restoration of suppressed HPG axis function post-anabolic steroid use. Kisspeptin-10 refers to the biologically active 10-amino acid C-terminal fragment, which retains full receptor-binding activity.
Mechanism of Action
Kisspeptin-10 binds to the KISS1R receptor (GPR54), a Gq/11-coupled GPCR expressed on GnRH neurons in the hypothalamus, triggering a robust, pulsatile release of gonadotropin-releasing hormone (GnRH). This downstream GnRH surge stimulates the anterior pituitary to secrete luteinizing hormone (LH) and follicle-stimulating hormone (FSH), which in turn drive gonadal steroidogenesis and gametogenesis. Unlike direct GnRH agonists, kisspeptin acts upstream and preserves some physiological pulsatility, making desensitization of pituitary receptors less of a concern with intermittent dosing.
Evidence by Health Goal(18 goals)
Dosing Protocols
Evening, ideally 30-60 minutes before sleep to align with circadian LH pulsatility
Cycle: 4-8 weeks on, 4 weeks off
Subcutaneous administration into abdominal fat is standard. Higher end of range (100-150mcg) used for HPG axis restoration post-cycle; lower end (50mcg) used for fertility stimulation protocols under medical supervision. Continuous daily use may lead to receptor desensitization - pulse dosing 2-3x per week may preserve sensitivity for long-term use.
Evening, approximately 30 minutes before sleep
Cycle: 4-6 weeks on, 4 weeks off
Intranasal bioavailability is significantly lower than subcutaneous injection (estimated 1-5%), requiring much higher nominal doses. Used in some clinical studies for convenience; efficacy data is less robust than parenteral routes. Nasal formulations are less common commercially and may require compounding.
Safety & Side Effects
Kisspeptin-10 has demonstrated a favorable safety profile in Phase I/II clinical trials with no serious adverse events reported at research doses, making it one of the safer peptides for HPG axis modulation. However, it is not approved as a therapeutic drug in most jurisdictions, exists in a regulatory gray area as a research chemical, and carries meaningful risks in female fertility contexts including ovarian hyperstimulation; use in women should only occur under direct medical supervision.
Possible Side Effects
- !Transient flushing and warmth sensation within 30-60 minutes of injection
- !Injection site erythema, mild swelling, or induration
- !Increased libido and sexual arousal, occasionally uncomfortable in intensity
- !Nausea or mild gastrointestinal discomfort at higher doses
- !Headache, typically mild and transient post-injection
- !Mood fluctuations or mild anxiety coinciding with acute LH/testosterone surges
- !Potential for receptor desensitization with continuous daily use, reducing efficacy over time
- !Ovarian hyperstimulation risk in females using fertility-directed protocols
Interactions
- -GnRH agonists/antagonists (leuprolide, cetrorelix): Pharmacodynamically antagonistic - concurrent use negates kisspeptin's upstream signaling and renders protocols ineffective
- -Testosterone replacement therapy (TRT): Exogenous androgens suppress hypothalamic KISS1R sensitivity via negative feedback, reducing kisspeptin response; do not use simultaneously
- -Opioids and opioid agonists: Endogenous and exogenous opioids suppress kisspeptin neuron activity via dynorphin pathways, significantly blunting LH response
- -Clomiphene citrate or selective estrogen receptor modulators (SERMs): May have additive effects on LH stimulation but also risk overstimulation - use in combination requires careful monitoring
- -Prolactin-elevating agents (antipsychotics, metoclopramide): Hyperprolactinemia suppresses kisspeptin neuron firing, reducing efficacy of the peptide
Cost & Where to Buy
Research-grade Kisspeptin-10 from reputable peptide vendors (e.g., Peptide Sciences, Limitless Life) typically runs $30-80 per 5mg vial; a daily 100mcg protocol uses roughly 3mg/month. Cost scales with dose and vendor purity standards. No pharmaceutical-grade commercial product is currently approved for general sale, so all sourcing is through research chemical suppliers.
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