Kisspeptin is a naturally occurring brain peptide — a small protein signal — produced mainly in the hypothalamus. It's encoded by the KISS1 gene and binds to a receptor called KISS1R. It's considered a critical regulator of the reproductive hormone axis and is essential for puberty onset and fertility in both males and females.[1] As a research compound, it is studied for its role in hormonal signaling and beyond.

How does Kisspeptin work?

Kisspeptin binds to its receptor (KISS1R) on brain cells, which triggers the release of GnRH (gonadotropin-releasing hormone). GnRH then signals the pituitary gland to release LH and FSH — the hormones that drive reproductive function in the ovaries and testes. Special brain neurons called KNDy neurons co-produce kisspeptin alongside neurokinin B and dynorphin to fine-tune this hormonal rhythm.[1]

What is Kisspeptin used for in research?

Research covers a broad range of areas: stimulating LH release, studying conditions like hypothalamic amenorrhoea and PCOS, tracking placental health during pregnancy, and investigating glucose metabolism. Women with PCOS show elevated kisspeptin levels,[5] while kisspeptin in the bloodstream during pregnancy may serve as a biomarker for complications like miscarriage or pre-eclampsia.[4] Its role in endometriosis is also under active investigation.[2]

How is Kisspeptin dosed in research?

Published studies have examined intranasal doses of 12.8 mcg per trial in healthy men, healthy women, and women with hypothalamic amenorrhoea to stimulate LH release. See the dosage chart on this page for a full breakdown, and use the calculator to assist with research calculations. All dosing information here is for educational reference only and reflects published research protocols — not clinical guidance.

How do you reconstitute Kisspeptin?

Kisspeptin typically comes as a freeze-dried (lyophilized) powder. To reconstitute it, slowly add sterile bacteriostatic water or sterile saline to the vial, then gently swirl — never shake vigorously or heat it. Once dissolved, store the solution refrigerated (2–8°C) and away from light. Label the vial with the reconstitution date and use within your institutional protocol's recommended timeframe.

Kisspeptin is a naturally occurring peptide in the human body, and it plays essential roles in normal physiology.[1] However, as a research compound it is not approved for human therapeutic use, and safety data from controlled clinical studies is still being gathered. Human studies have explored its effects on hormone release[1] and insulin secretion,[3] but this page is not medical advice. Consult qualified researchers and institutional ethics guidelines before any research use.

Kisspeptin Dosage Chart, Protocol & Calculator

A hypothalamic peptide studied for reproductive hormone signaling.

Goal	Dose	Frequency	Duration	Evidence	Source
Stimulate gonadotropin release (LH) via intranasal route in healthy men	12.8 mcg	per trial	per trial	Clinical	PMID 40215751
Stimulate gonadotropin release (LH) via intranasal route in healthy women	12.8 mcg	per trial	per trial	Clinical	PMID 40215751
Stimulate gonadotropin release (LH) via intranasal route in patients with hypothalamic amenorrhoea	12.8 mcg	per trial	per trial	Clinical	PMID 40215751

What is Kisspeptin?

Kisspeptin is a naturally occurring signaling peptide — a small protein messenger — produced in the brain. Specifically, it comes from a region called the hypothalamus. Its job? To act like a starter pistol for the reproductive hormone system. Scientists call the gene that makes it KISS1, and the receptor it docks onto is called KISS1R.^[1]

Kisspeptin belongs to a family of neuropeptides — brain-signaling proteins — that are considered essential for the start of puberty and for normal fertility in both men and women.^[6] As a research compound, it is being studied for its wide-ranging influence on reproductive hormones, pregnancy, metabolic health, and more.

Important note: Kisspeptin is a research-use-only peptide. Nothing on this page is medical advice. Always follow institutional research protocols.

How Kisspeptin Works

Think of the reproductive hormone system as a line of falling dominoes. Kisspeptin tips the first domino. Here's the chain:

Kisspeptin binds to its receptor, KISS1R, on specialized brain cells.
This triggers the release of GnRH (gonadotropin-releasing hormone) — the brain's main reproductive command signal.
GnRH then tells the pituitary gland (a pea-sized gland at the base of the brain) to release LH (luteinizing hormone) and FSH (follicle-stimulating hormone).
LH and FSH then travel to the ovaries or testes to drive reproduction.^[1]

Researchers have also discovered a special group of neurons in the brain called KNDy neurons. These neurons co-produce kisspeptin alongside two other signaling chemicals — neurokinin B and dynorphin. Together, these three chemicals fine-tune the rhythmic pulses of reproductive hormones, including acting as a feedback loop for estrogen.^[1]

A simple analogy: if GnRH is the ignition key for the reproductive engine, kisspeptin is the hand that turns that key.

What the Research Shows

Research on kisspeptin spans reproductive health, pregnancy monitoring, metabolic function, and gynecological conditions.

Reproductive Hormone Control

Studies confirm that kisspeptin is a critical central regulator of GnRH release and plays a key role in puberty initiation, follicle development, egg maturation, and ovulation in females. In males, it's involved in sperm production and the function of testosterone-producing Leydig cells. When the KISS1 gene or KISS1R receptor is disrupted by mutations, the result can be conditions like idiopathic hypogonadotropic hypogonadism — essentially a shutdown of the reproductive hormone axis — or, at the other extreme, early-onset puberty.^[1]

Polycystic Ovary Syndrome (PCOS)

PCOS is one of the most common hormonal disorders in women of reproductive age. Research suggests that women with PCOS tend to have higher circulating kisspeptin levels than women without the condition. The hypothesis is that an overactive KISS1 system drives excessive activity in the reproductive hormone axis, contributing to the irregular cycles and elevated androgens (male-type hormones) seen in PCOS.^[5]

Pregnancy Biomarker Potential

During healthy pregnancy, kisspeptin levels rise dramatically in the bloodstream — and almost all of it comes from the placenta. Researchers are exploring whether measuring kisspeptin levels could help predict complications like miscarriage, ectopic pregnancy, preterm birth, fetal growth restriction, pre-eclampsia, and gestational diabetes.^[4] Earlier work also highlighted kisspeptin's potential as a biomarker for detecting miscarriage and pre-eclampsia, and suggested it may even stimulate oxytocin release near the time of birth.^[6]

Endometriosis

Emerging research has found altered kisspeptin and KISS1R levels in the uterine tissue of women with endometriosis — both in normal uterine lining and in displaced tissue lesions. Scientists are investigating whether kisspeptin plays a role in the tissue invasion and lesion formation that characterize the disease, and whether kisspeptin-based strategies might offer targeted treatments with fewer side effects than current options.^[2]

Glucose and Metabolic Health

Beyond reproduction, kisspeptin may influence how the body manages blood sugar. Human studies have found associations between kisspeptin levels and insulin secretion and insulin resistance. One interventional human study found that kisspeptin can enhance glucose-stimulated insulin secretion — meaning it may help the pancreas release more insulin when blood sugar rises. Researchers note that animal study results have been conflicting, and more work is needed.^[3]

What Kisspeptin Is Being Studied For

Stimulating LH (luteinizing hormone) release in healthy men and women via intranasal delivery^[1]
Investigating hormonal deficits in hypothalamic amenorrhoea (missing periods due to brain-level hormone disruption)^[1]
Understanding PCOS hormone dysregulation^[5]
Tracking placental health and predicting pregnancy complications^[4][6]
Exploring its role in endometriosis pathology and potential therapy^[2]
Investigating effects on insulin secretion and glucose metabolism^[3]

How Kisspeptin Is Dosed in Research

Dosing in published research varies by route of administration, target population, and research goal. The dosage chart on this page summarizes the reference doses used in studies — including the intranasal 12.8 mcg per-trial amounts studied in healthy men, healthy women, and women with hypothalamic amenorrhoea to stimulate LH release. Use the calculator on this page to cross-reference doses with body weight or volume. These figures are drawn strictly from published research and are provided for educational reference only.

Mixing and Storing Kisspeptin

Like most research peptides, kisspeptin typically arrives as a lyophilized powder — that means freeze-dried for stability. Before use in research, it must be reconstituted, which simply means dissolving it in a liquid, usually sterile bacteriostatic water or sterile saline. Add the liquid slowly to the powder vial, let it dissolve gently without shaking hard, and never use heat. Once reconstituted, store it refrigerated (around 2–8°C / 36–46°F), keep it away from light, and use it within the timeframe specified by your supplier or institutional protocol. Dry, unreconstituted powder can typically be stored longer-term in a freezer. Always label vials clearly with the date of reconstitution.

Sources

The Role of Kisspeptin in the Control of the Hypothalamic-Pituitary-Gonadal Axis and Reproduction. — Frontiers in endocrinology, 2022. PMID 35837314.
Kisspeptin and Endometriosis-Is There a Link? — Journal of clinical medicine, 2024. PMID 39768606.
Kisspeptin and Glucose Homeostasis. — Seminars in reproductive medicine, 2019. PMID 31869842.
Kisspeptin in the Prediction of Pregnancy Complications. — Frontiers in endocrinology, 2022. PMID 35928889.
Kisspeptin and Polycystic Ovary Syndrome. — Frontiers in endocrinology, 2019. PMID 31156550.
Kisspeptin as a potential biomarker throughout pregnancy. — European journal of obstetrics, gynecology, and reproductive biology, 2019. PMID 31344665.

Kisspeptin Guide & Dosage Chart