HCG vs Kisspeptin-10
HCG (Gonadotropin) and Kisspeptin-10 (Neuropeptide hormone) are documented as co-studied in the PeptiDex library. This page puts the two entries side by side on class, molecular weight, half-life, origin, mechanism and studied research areas — every value taken from the entry it belongs to.
Why these two are co-studied
Cross-referenced for research context — not a usage or combination recommendation.
At a glance
| Attribute | HCG | Kisspeptin-10 |
|---|---|---|
| Compound class | Gonadotropin | Neuropeptide hormone |
| Research category | Hormonal & Sexual Health | Hormonal & Sexual Health |
| Length (amino acids) | Not documented | 10 amino acids |
| Molecular weight | ~36,700 Da (glycoprotein heterodimer) | ~1302 g/mol |
| Half-life | ~30 hours (terminal) | ~4 minutes (IV bolus, human) |
| Origin | Human chorionic gonadotropin (HCG) is a glycoprotein hormone produced by the placenta during pregnancy. Pharmaceutical HCG is obtained from the urine of pregnant women or produced by recombinant technology (choriogonadotropin alfa). | Kisspeptin-10 is the C-terminal decapeptide of kisspeptin, a neuropeptide encoded by the KISS1 gene. Kisspeptins are endogenous ligands for the KISS1R (GPR54) receptor and are central regulators of reproductive endocrinology. |
“Not documented” means the PeptiDex entry records no value for that field. Nothing on this page is estimated, and no figure is carried over from one compound to the other.
How HCG works
HCG is a heterodimeric glycoprotein consisting of an alpha subunit (shared with LH, FSH, TSH) and a hormone-specific beta subunit. It acts as an agonist at the luteinizing hormone/choriogonadotropin receptor (LHCGR), thereby mimicking LH activity. In the gonads this stimulates testicular Leydig cells to produce testosterone and supports ovarian steroidogenesis and ovulation, which underlies its clinical use in fertility and endocrine medicine.
How Kisspeptin-10 works
Kisspeptin-10 binds the G-protein-coupled receptor KISS1R (GPR54) on hypothalamic GnRH neurons, stimulating the release of gonadotropin-releasing hormone. Downstream, GnRH acts on the pituitary to promote secretion of luteinizing hormone (LH) and follicle-stimulating hormone (FSH), placing kisspeptin at the apex of the hypothalamic-pituitary-gonadal axis. Because it acts upstream of GnRH, it is studied as a physiological modulator of reproductive hormone release.
Mechanistic descriptions reflect published research-literature understanding and are quoted from each compound's own entry. Much peptide research is preclinical (in-vitro or animal-model); mechanism in humans may differ and is not established for many compounds.
Where each one appears in the literature
The research contexts each entry documents. Listing a research area is not a claim of efficacy or a therapeutic indication, and the two lists are not scored against each other.
HCG
Kisspeptin-10
What sets each apart
HCG
HCG acts directly at the gonadal LHCGR as an LH mimic, unlike GnRH analogs (gonadorelin/triptorelin) that act at the pituitary or kisspeptin acting on GnRH neurons.
Kisspeptin-10
Kisspeptin acts one step upstream of GnRH (stimulating GnRH neurons), whereas gonadorelin/triptorelin act directly on pituitary GnRH receptors and HCG/HMG act at the gonadal level.
Frequently asked questions
What is HCG?
HCG (human chorionic gonadotropin) is a glycoprotein hormone that shares its alpha subunit with LH, FSH and TSH and binds the LH/hCG receptor with high affinity. Because it mimics luteinizing hormone at the gonad, it is studied as a direct gonadotropic stimulus of Leydig-cell (testosterone) and ovarian function.
What is HCG studied for in HPG-axis research?
In male models it is studied for stimulating Leydig-cell activity and intratesticular testosterone, and in axis-recovery research following exogenous androgen suppression. In female reproductive research it is studied as an ovulatory trigger. It is a regulated pharmaceutical hormone, not an approved research-chemical use.
Why does HCG have a much longer duration than LH?
HCG's terminal half-life is roughly 30 hours versus about 30 minutes for LH, owing to its heavier glycosylation and slower clearance. Because of this, peak testosterone responses in studies are typically seen ~72-96 hours after a dose, which shapes dosing intervals in research protocols.
Why is kisspeptin studied alongside GnRH-axis compounds?
Kisspeptin sits upstream of GnRH neurons, so it is used in research to probe HPG-axis integrity from a different node than direct GnRH agonists such as gonadorelin or LH-mimetics such as HCG. Comparing responses helps localize where an axis defect lies.
What is kisspeptin-10?
Kisspeptin-10 (Kp-10) is the C-terminal decapeptide fragment of the larger kisspeptin-54 protein, the product of the KISS1 gene. It acts on the KISS1R (GPR54) receptor on hypothalamic GnRH neurons and is studied as an upstream trigger of the hypothalamic-pituitary-gonadal (HPG) axis, stimulating GnRH and downstream LH/FSH release.
What is kisspeptin-10 studied for?
In research it is studied as a stimulator of endogenous GnRH secretion and LH pulsatility, and in models of hypothalamic amenorrhea, reproductive endocrinology, and fertility. It has also been investigated in studies of sexual arousal processing. It is a research compound and is not an approved drug for these uses.
Answers are the ones published on each compound's own PeptiDex entry. They are educational summaries of research-literature context and are not medical advice.