Research Comparison

HCG vs Kisspeptin

In Short

HCG is glycoprotein gonadotropin (lh/cg receptor agonist); Kisspeptin is kiss1-derived neuropeptide; gpr54/kiss1r agonist. Both are supplied as lyophilized powders for laboratory and in-vitro research use only. The table below compares their molecular data, half-life and research focus side by side.

	HCG	Kisspeptin
Classification	Glycoprotein gonadotropin (LH/CG receptor agonist)	KISS1-derived neuropeptide; GPR54/KISS1R agonist
Molecular formula	—	—
Molecular weight	—	—
CAS number	9002-61-3	—
Research half-life	Biphasic; approximately 6-12 hours initial and ~24-36 hours terminal in published human pharmacokinetic studies (long-acting relative to LH)	Short; kisspeptin-10 reported on the order of minutes, with the longer kisspeptin-54 isoform showing a more prolonged but still short plasma half-life in published human infusion studies
Primary research focus	LH/hCG receptor signaling research	Reproductive hormone regulation
Form	Lyophilized powder	Lyophilized powder
Price from	$75.00	$49.40

HCG

Human chorionic gonadotropin is a glycoprotein hormone that mimics luteinizing hormone by binding the LH/hCG receptor on Leydig and granulosa cells. In research settings it is used as a tool to study steroidogenesis, gonadal function, and the hypothalamic-pituitary-gonadal axis, including models of testosterone production and ovulation induction pathways. Because of its long half-life and potent receptor activity, it is a common reference agonist in reproductive endocrinology research. Supplied as a lyophilized powder for in-vitro and laboratory research use only; not for human or veterinary use.

Full HCG research guide

Kisspeptin

Kisspeptin-10 is the minimal bioactive C-terminal decapeptide fragment of the full-length kisspeptin-54 (metastin), encoded by the KISS1 gene. It acts as an endogenous ligand for the GPR54 receptor (KISS1R), a G-protein coupled receptor expressed predominantly on hypothalamic GnRH neurons. Kisspeptin-10 binding to KISS1R potently stimulates gonadotropin-releasing hormone (GnRH) secretion, which in turn drives luteinizing hormone (LH) and follicle-stimulating hormone (FSH) release from the anterior pituitary, making it a master regulator of the hypothalamic-pituitary-gonadal (HPG) axis. Landmark research by Dhillo et al. (2005) published in The Journal of Clinical Endocrinology & Metabolism demonstrated that intravenous Kisspeptin-10 use in healthy men produced potent, concentration-dependent increases in plasma LH, FSH, and testosterone levels. Studies by Jayasena et al. (2011) in the same journal showed that kisspeptin infusion restored LH pulsatility in women with hypothalamic amenorrhea. Research published in Human Reproduction by Abbara et al. demonstrated that kisspeptin could safely trigger oocyte maturation in IVF studies with reduced risk of ovarian hyperstimulation syndrome compared to hCG triggers. Compared to GnRH analogues (leuprolide, gonadorelin), Kisspeptin-10 acts upstream at the hypothalamic level, providing a more physiological stimulus pattern. Unlike continuous GnRH agonist exposure, which causes receptor desensitization and eventual HPG axis suppression, kisspeptin appears to maintain responsiveness, making it valuable for studying natural reproductive physiology. Store lyophilized Kisspeptin-10 at -20°C. Reconstitute with bacteriostatic water and store at 2-8°C, using within 3 weeks. This peptide is actively researched by reproductive endocrinologists, fertility scientists, neuroendocrinologists, and metabolic researchers studying kisspeptin's emerging roles in glucose homeostasis and body composition.

Full Kisspeptin research guide

Frequently Asked Questions

What is the main difference between HCG and Kisspeptin?

HCG is classified as glycoprotein gonadotropin (lh/cg receptor agonist), while Kisspeptin is kiss1-derived neuropeptide; gpr54/kiss1r agonist. They are distinct research compounds with different mechanisms — the comparison table above sets out the molecular and pharmacokinetic differences side by side.

Can HCG and Kisspeptin be studied together?

Some research protocols evaluate related peptides in combination, and research blends exist. Combination study design depends entirely on the research question and model. Both compounds are supplied for laboratory and in-vitro research use only — not for human use.

Are HCG and Kisspeptin legal to buy for research?

Both are sold in the United States as research chemicals for laboratory and in-vitro use only. Neither is FDA-approved for human use. Researchers are responsible for compliance with all applicable regulations.

Buy HCG

From $75.00 — ≥98% HPLC, COA included.

Buy Kisspeptin

From $49.40 — ≥98% HPLC, COA included.

Research Use Only. This comparison summarizes published research. It is not medical advice. Neither compound is for human consumption or FDA-approved.