Source comparison
Kisspeptin vs Gonadorelin vs hCG vs Enclomiphene
Five compounds, four different entry points into the same axis. The higher up the chain a compound acts, the more of the natural feedback loop stays intact, and the more the pulsatility problem matters. Kisspeptin-10 Activates KISS1R on GnRH neurons Hypothalam
This comparison does not assign a generated winner or score.
- Five compounds, four different entry points into the same axis. The higher up the chain a compound acts, the more of the natural feedback loop stays intact, and the more the pulsatility problem matters.
- Kisspeptin-10
- Activates KISS1R on GnRH neurons
- Hypothalamus, above GnRH
- IV bolus and infusion in healthy men; LH 4.1 → 12.4 IU/L at 1 mcg/kg (George 2011)
- ~4 min half-life; no chronic protocol
- Kisspeptin-54
- Same receptor, longer exposure
- IVF oocyte trigger; LH and testosterone rise in men (Dhillo 2005; Abbara 2015)
- Tachyphylaxis by day 14 of twice-daily dosing (Jayasena 2009)
- Gonadorelin
- Synthetic GnRH, pulsatile LH/FSH release
- Pituitary
- Established endocrine use; pulse-pump therapy for hypothalamic hypogonadism
- Continuous exposure suppresses LH (Conn 1991)
- hCG
- Mimics LH directly at the testis
- Testis (Leydig cells)
- Long clinical history for fertility and TRT adjunct
- Bypasses pituitary; no feedback preserved
- Enclomiphene
- Blocks estrogen negative feedback
- Pituitary / hypothalamus
- Phase II: raised morning testosterone and LH while preserving sperm counts (Wiehle et al., Fertil Steril, 2014, PMID 25044085)
- Oral SERM, not a peptide; estrogenic side effects
- Kisspeptin-54 triggering is the most convincing clinical result in the whole file. At 3.2 to 12.8 nmol/kg, oocyte maturation occurred in 95% of women, and no woman developed moderate, severe, or critical ovarian hyperstimulation syndrome (Abbara et al., J Clin Endocrinol Metab, 2015, PMID 26192876). Note what that trial is: one dose, one moment, one supervised outcome. That is where kisspeptin shines and where the evidence stops.
- For how these fit alongside everything else men reach for, see peptides for men.