Source comparison
Kisspeptin Isoform Comparison — Clinical Research Context
Kisspeptin-54 54 amino acids High (Kd ~1–5 nM) 28–32 minutes (IV), 4–6 hours (SC) 0.3–6.4 nmol/kg Ovulation induction, HPG axis assessment Gold standard for fertility protocols. Longest receptor residence time and most robust LH surge induction Kisspeptin-10 1
This comparison does not assign a generated winner or score.
- Kisspeptin-54
- 54 amino acids
- High (Kd ~1–5 nM)
- 28–32 minutes (IV), 4–6 hours (SC)
- 0.3–6.4 nmol/kg
- Ovulation induction, HPG axis assessment
- Gold standard for fertility protocols. Longest receptor residence time and most robust LH surge induction
- Kisspeptin-10
- 10 amino acids (C-terminal fragment)
- Moderate (Kd ~5–10 nM)
- 12–18 minutes (IV)
- 0.5–10 nmol/kg
- Experimental protocols, research models
- Faster clearance limits sustained GnRH pulsatility. Useful for acute challenges but less reliable for ovulation triggering
- Kisspeptin-13
- 13 amino acids
- Moderate-High (Kd ~2–8 nM)
- 18–24 minutes (IV)
- Not standardised in clinical trials
- Limited human research
- Intermediate potency. No clear advantage over kisspeptin-54 in published trials
- Kisspeptin-54 consistently outperforms shorter isoforms in fertility research because its extended half-life sustains GnRH receptor activation long enough to produce a physiological LH surge. Kisspeptin-10, despite being the minimal active fragment, clears too rapidly to generate the sustained GnRH pulsatility required for full ovulation induction. It works in rodent models where cycle lengths are hours, not days, but translates poorly to human reproductive timescales.