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Hormonal & Sexual Health — Category Hub

Peptides studied in reproductive endocrinology and neuropeptide research — Kisspeptin-10, Gonadorelin, Triptorelin, HCG, HMG and PT-141.

For research and educational purposes only. This page is not medical advice. No dosing or human-use instructions are provided.

What this category covers

Most compounds here act somewhere along the hypothalamic-pituitary-gonadal (HPG) axis, and their differences are best understood by where on that axis they act.

Upstream, at the hypothalamus: Kisspeptin-10 is studied as a regulator of GnRH release — a step above GnRH itself. At the GnRH receptor: Gonadorelin is synthetic GnRH with a short half-life, while Triptorelin is a longer-acting GnRH agonist. The half-life difference is not a minor detail: sustained GnRH-receptor agonism produces receptor downregulation, which is the opposite of the pulsatile stimulation short-acting analogs are studied for. Downstream, at the gonads: HCG acts on the LH receptor directly, and HMG supplies both FSH and LH activity.

PT-141 (Bremelanotide) sits outside the HPG axis entirely. It is a melanocortin-receptor agonist studied in central-nervous-system pathways, making it mechanistically closer to the melanocortin analogs Melanotan I and II than to the gonadotropins it is catalogued alongside.

Entries in this category

Every entry in this category in the PeptiDex library, with its compound class and a one-line research summary. Follow any entry for the full research overview, mechanism, reported research dosing, and studied effects.

Kisspeptin-10Neuropeptide hormone — A decapeptide studied in reproductive endocrinology research.PT-141 (Bremelanotide)Melanocortin receptor agonist — A melanocortin-receptor agonist studied in neuropeptide research.HCGGonadotropin — Human chorionic gonadotropin, a glycoprotein hormone studied in reproductive-endocrinology research.Gonadorelin AcetateGnRH analog — A synthetic decapeptide form of gonadotropin-releasing hormone (GnRH) referenced in reproductive-endocrinology research.HMG (Menotropin)Gonadotropin — Human Menopausal Gonadotropin — a mixture of FSH and LH referenced in reproductive-endocrinology research.Triptorelin AcetateGnRH analog — A synthetic decapeptide GnRH agonist referenced in reproductive-research literature.

Why pulsatile versus continuous matters

The HPG axis responds to the pattern of stimulation, not just its presence. This is the single most important concept for reading research in this category: a short-acting GnRH analog and a long-acting one produce opposite downstream effects at the same receptor. Any comparison of these compounds that ignores half-life is comparing the wrong variable.

See also

  • Growth & GH-Axis hub — the other major hypothalamic-pituitary axis in the library, where the same pulsatility principle applies.
  • Cosmetic & Dermal hub — the melanocortin analogs that share PT-141's receptor family.
  • Glossary — HPG axis, GnRH, gonadotropin, agonist and downregulation.

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