About Kisspeptin

Kisspeptin is a neuropeptide critical to the hypothalamic-pituitary-gonadal (HPG) axis. It’s the upstream signal that triggers GnRH (gonadotropin-releasing hormone) release from the hypothalamus, which in turn drives LH and FSH secretion from the pituitary, which in turn drives testosterone and oestrogen production from the gonads. Without kisspeptin signalling, the entire reproductive endocrine axis fails — humans with kisspeptin receptor mutations present with hypogonadotropic hypogonadism.

Research interest spans hypogonadism (where exogenous kisspeptin can restart the natural axis), fertility research (kisspeptin-induced ovulation studied in IVF protocols), and as a more physiological alternative to GnRH analogues for HPG axis stimulation. The most-studied research forms are Kisspeptin-10 (a 10-residue fragment) and Kisspeptin-54 (the longer endogenous form).

Dosing observed in research literature

Form	Dose range	Frequency	Route
Kisspeptin-10	2.4–9.6 nmol/kg	Single bolus	SubQ or IV
Kisspeptin-54	1.5–6.4 nmol/kg	Single bolus or infusion	SubQ or IV
Practical research dose (Kiss-10)	~200–500 mcg	Daily or as-needed	SubQ injection

Kisspeptin is one of the most potent peptides in this library by weight — effective doses are in the microgram range. Research protocols vary widely depending on application: single-bolus studies for axis assessment, repeated dosing for sustained HPG stimulation, infusion protocols for steady-state studies.

Typical reconstitution protocols

Kisspeptin-10 ships as a 1 mg or 5 mg lyophilised vial:

Vial size	BAC water	Concentration	200 mcg draw	500 mcg draw
1 mg	2 mL	500 mcg/mL	40 units (U-100)	100 units
5 mg	2 mL	2500 mcg/mL	8 units	20 units
5 mg	5 mL	1000 mcg/mL	20 units	50 units

Half-life and storage

Plasma half-life of Kisspeptin-10 is very short — approximately 5 minutes. Kisspeptin-54 is somewhat longer at around 30 minutes. The brevity is by design: the natural HPG axis uses kisspeptin as a pulsatile signal, not a sustained one. Research protocols mirror this pulsatile pattern. Storage: lyophilised refrigerated, reconstituted up to 28 days refrigerated. Never freeze.

Frequently asked questions

What’s the difference between Kisspeptin-10 and Kisspeptin-54?

Both bind the same receptor (KISS1R / GPR54) with similar affinity. Kisspeptin-54 is the full-length endogenous form with a longer half-life; Kisspeptin-10 is the C-terminal active fragment, shorter half-life but easier to synthesise. For most research applications either works — the choice usually comes down to supplier availability and dosing convenience.

Does kisspeptin raise testosterone directly?

Indirectly. Kisspeptin triggers GnRH → LH → testicular testosterone production. The cascade takes hours from injection to measurable testosterone elevation. The effect is more physiological than exogenous testosterone replacement but smaller in absolute magnitude.

Is kisspeptin used for fertility research?

Yes — particularly for inducing ovulation in IVF protocols. Kisspeptin’s more physiological trigger produces lower rates of ovarian hyperstimulation than hCG in some published studies, which has driven significant research interest in reproductive medicine.

What injection site is used?

Subcutaneous abdominal injection is the documented standard for ongoing protocols. IV use is reserved for acute-bolus research studies where rapid plasma kinetics are needed.

Related compounds

Kisspeptin sits in the specialty research category as the HPG-axis activator. Adjacent: Oxytocin (other neuropeptide research applications), PT-141 (different mechanism, related sexual-function research interest). For full category overview: Specialty Research Compounds.