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Kisspeptin

Last reviewed: April 18, 2026 by The Peptide Catalog Team

A hormone peptide for natural testosterone support and reproductive health. Kisspeptin is a neuropeptide that acts as the master regulator of the reproductive hormone axis. It stimulates GnRH release from the hypothalamus, which triggers LH and FSH secretion. Used in fertility treatments, hormone optimization, and research into puberty and reproductive disorders. Also shows promise for metabolic regulation and mood.

CategorySexual Health & Hormone Peptides
Classhormone analog
GoalSexual Health
Overview

Core Benefits

Key Advantages
HPG-axis stimulation
Drives natural LH and FSH release through GnRH stimulation.
Fertility/libido research
Used in IVF to trigger ovulation — lower OHSS risk than hCG.
Testosterone support
Acutely raises testosterone in men through the GnRH-LH pathway.
Differs from PT-141
Hormonal pathway — not direct CNS libido stimulation.
Metabolic research
Emerging links to glucose metabolism and appetite.
Mild side effect profile
Works through natural pathways — well-tolerated in trials.

These are educational summaries of commonly discussed effects in wellness/regenerative contexts, not guarantees.

Kisspeptin Results Timeline

Progression
1
Acute (hours)
Physical Changes
Possible flushing, warmth
Performance & Recovery
Rapid LH/FSH surge within 30-60 minutes
Other Benefits
Used clinically for single-dose ovulation triggering
2
Short-term
Physical Changes
Hormonal surge may cause mild warmth, flushing
Performance & Recovery
Acute testosterone increase in men (research)
Other Benefits
Effects are pulsatile and short-lived (~30 min half-life)
3
Clinical Use
Physical Changes
May improve hormone-related symptoms over time
Performance & Recovery
Triggers egg maturation in IVF protocols
Other Benefits
Lower OHSS risk vs hCG for ovulation induction
4
Research Note
Physical Changes
Long-term: potential improvements in hormone balance
Performance & Recovery
Hormone axis effects, reproductive health focus
Other Benefits
Long-term protocols for hormone optimization still being studied

Timeline is illustrative and non-guaranteed. Outcomes vary and are commonly discussed alongside training, nutrition, sleep, and cycling practices.

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Evidence at a glance

Two parallel grades per outcome — clinical RCT depth and real-world community adoption. See the Research Overview below for citations and detail.

OutcomeClinical EvidenceCommunity Evidence
Stimulation of LH / testosterone in menModeratePreliminary
Hypothalamic amenorrhea / reproductive functionModeratePreliminary
IVF egg maturation triggerModeratePreliminary
How It WorksReproductive Peptide — GnRH Stimulator

Receptor → GnRH Cascade → Hormone Production → Outcomes

1
Target

KISS1R (GPR54) on GnRH Neurons

Kisspeptin activates KISS1R receptors on GnRH (gonadotropin-releasing hormone) neurons in the hypothalamus. This triggers the entire reproductive hormone cascade: GnRH → LH/FSH → testosterone/estrogen. Kisspeptin is the brain's master switch for reproductive function.

2
Cellular Signal

KISS1R → GnRH Pulse → LH/FSH Release

Kisspeptin binding triggers GnRH pulses from the hypothalamus, which stimulate LH and FSH release from the pituitary. The pulsatile nature is critical — continuous stimulation would actually suppress the axis (like GnRH agonist drugs used in prostate cancer).

3
Systemic Effect

Pulsatile LH/FSH → Gonadal Hormone Production

In males: increased testosterone production. In females: stimulates ovulation (used in fertility clinics as an alternative to hCG triggers). The physiological, pulsatile stimulation is less likely to cause overstimulation compared to direct gonadotropin injections.

4
What You Notice

Hormonal Optimization → Fertility Support

Used primarily for fertility protocols and hormone optimization. Effects on testosterone or fertility markers measurable via bloodwork within days. This is typically an acute or short-term protocol peptide, not a continuous daily treatment.

What Makes This Peptide Different

Kisspeptin works upstream of the entire reproductive axis— it's the natural trigger for GnRH release. This makes it more physiological than directly injecting hCG, clomid, or gonadotropins. In fertility medicine, kisspeptin-54 triggers can reduce the risk of ovarian hyperstimulation syndrome (OHSS). Still primarily a research and clinical tool rather than a daily-use peptide.

Research overview

Outcome-by-outcome look at what the evidence actually supports for Kisspeptin, including human vs. animal study counts and our editorial take on each.

HPG axis stimulation in men

Clinical:ModerateCommunity:Preliminary

Dhillo 2005 was the first human study to show that kisspeptin-54 administration significantly increases plasma LH, FSH, and testosterone in healthy men. Subsequent work has demonstrated similar effects in hypogonadotropic populations, with kisspeptin agonists being developed as fertility-preserving alternatives to testosterone replacement therapy.

4 human studies · 12 animal studies

Key findings & citations
  • Kisspeptin-54 acutely raises LH, FSH, and testosterone in healthy men.
  • Effects preserved in hypogonadotropic populations.
  • Drug-development pipeline (TAK-448, others) targets fertility-preserving androgen restoration.

Our take

Mechanistically a real, fertility-preserving way to raise testosterone. Approved kisspeptin therapeutics don't yet exist — most clinical-grade kisspeptin remains research-only.

Female reproductive function

Clinical:ModerateCommunity:Preliminary

Jayasena/Dhillo and colleagues have shown that kisspeptin restores LH pulsatility in women with hypothalamic amenorrhea and can serve as an alternative ovulation trigger in IVF protocols, with reduced risk of ovarian hyperstimulation syndrome compared to hCG triggering.

3 human studies · 4 animal studies

Key findings & citations
  • Restores LH pulsatility in hypothalamic amenorrhea.
  • Effective IVF ovulation trigger with reduced OHSS risk.
  • No FDA-approved kisspeptin product in clinical use as of 2026.

Our take

Genuine fertility-medicine application; community use for general 'hormone optimization' is far ahead of the supporting data.

What Kisspeptin doesn't do

Claims that current evidence does not support. Worth knowing before you set expectations.

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Dosing ProtocolSexual Health / Hormone Optimization

Educational reference only. Individual responses vary. Consult healthcare provider before use.

Vial Size
5 mg
Reconstitution
2 ml BAC water
Dose
125 mcg (5 units on 1ml syringe)
Timing
1 hour before bed
Frequency
Every day
Duration
30 days on, 30 days off
Protocol Notes
Stimulates GnRH → LH/FSH release. Supports natural testosterone production and reproductive health.

Why This Dosing Protocol

Why acute/short-term? Kisspeptin is typically used for specific purposes (ovulation trigger, diagnostic testing, short hormone optimization) rather than continuous treatment. The reproductive axis has strong feedback mechanisms.

Why pulsatile matters: Continuous kisspeptin exposure can desensitize KISS1R and paradoxically suppress the reproductive axis. Acute dosing preserves the natural pulsatile signaling pattern.
Full Dosing GuideReconstitution CalculatorCycle Cost Calculator

Reconstitution Calculator

Dilution math and unit conversions. Prefilled using a common vial size for this peptide.

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Storage & Handling

Storage at a glance

Proper storage temperatures, shelf life, reconstitution best practices, and travel tips for lyophilized and reconstituted peptides.

Powder: Freezer
1+ year at -20°C
Reconstituted: Fridge
4 weeks max at 2-8°C
View Complete Storage Guide

Handling specifics

Educational overview on storage, labeling, and traceability considerations for lab environments. Consult primary literature and vendor documentation for specifics.

Powder storage (very stable)
  • Freezer (-20°C): 1+ year
  • Refrigerator (2-8°C): 1-3 months
  • Room temperature: 2-3 weeks (emergency only)
Reconstituted storage (fragile)
  • MUST refrigerate at 2-8°C
  • 4-week maximum shelf life
  • NEVER freeze after reconstitution
  • Use bacteriostatic water for multi-dose
Molecular Structure

Kisspeptin sequence

Click any residue to see its properties.

HydrophobicPolarAcidic (−)Basic (+)Special

Sequence-derived properties

Length
10 residues
Molecular weight
1303.4 Da
backbone only
Avg hydrophobicity
-0.55
Kyte–Doolittle scale

Residue classes

Hydrophobic: 4 (40%)Polar: 4 (40%)Basic (+): 1 (10%)Special: 1 (10%)

Net charge distribution

Positive1 (10%)
Neutral9 (90%)
Negative0 (0%)

Amino acid frequency

F×2N×2G×1L×1R×1S×1W×1Y×1

Modifications

  • Kisspeptin-10 active fragment
  • C-terminal amidation

Sequence and properties provided for educational reference. Not for clinical dosing decisions.

  • Type: Neuropeptide
    (Produced in hypothalamus)
  • Active Form: Kisspeptin-10
    (10 amino acids)
  • Receptor: KISS1R (GPR54)
    (G protein-coupled receptor)
  • Half-Life: ~28 minutes
    (Short-acting, pulsatile)
Hormone Cascade
Kisspeptin → GnRH release → LH/FSH secretion → Testosterone/Estrogen production
Used in fertility clinics as an alternative to hCG for triggering ovulation in IVF. May reduce risk of ovarian hyperstimulation syndrome (OHSS) by working through natural pathways.
Key takeaway: Kisspeptin's role as the "gatekeeper" of reproduction makes it a promising target for fertility treatments, hormone optimization, and understanding puberty disorders.

FAQ

What is kisspeptin and what does it do?

Kisspeptin is a neuropeptide produced in the hypothalamus that acts as the master regulator of the reproductive hormone axis. It stimulates GnRH (gonadotropin-releasing hormone) neurons, which triggers the release of LH (luteinizing hormone) and FSH (follicle-stimulating hormone) from the pituitary gland. This cascade controls testosterone, estrogen, and fertility.

How is kisspeptin used in fertility treatments?

Kisspeptin is being studied as an alternative to hCG for triggering ovulation in IVF cycles. It may reduce the risk of ovarian hyperstimulation syndrome (OHSS) because it works through the natural GnRH pathway rather than directly stimulating the ovaries. Clinical trials have shown it can successfully trigger egg maturation for retrieval.

Can kisspeptin boost testosterone in men?

Yes, kisspeptin stimulates the natural testosterone production pathway by triggering GnRH → LH release. Studies show it can acutely increase LH and testosterone levels in men. However, the effects are pulsatile and short-lived, so it's being researched for potential therapeutic applications in hypogonadism rather than as a standalone testosterone booster.

What forms of kisspeptin are available?

The most common research form is kisspeptin-10, a 10-amino acid fragment of the full kisspeptin-54 protein. Kisspeptin-10 retains full biological activity at the kisspeptin receptor (KISS1R). The full-length kisspeptin-54 and intermediate forms (kisspeptin-14, kisspeptin-13) also exist but kisspeptin-10 is most widely used in research.

What are the potential side effects of kisspeptin?

Kisspeptin is generally well-tolerated in clinical studies. Reported side effects are typically mild and may include injection site reactions, temporary flushing, and headache. Because it works through the natural hormone axis, it doesn't carry the same risks as direct hormone administration. Long-term safety data is still being collected.

How long does reconstituted peptide last?

Once mixed with bacteriostatic water, peptides remain stable for up to 4 weeks when refrigerated at 2-8°C (36-46°F). Unopened powder can last 1+ year in the freezer. Get our complete Storage & Travel Guide.

Is this peptide legal to purchase?

Peptides sold "for research purposes only" are legal to purchase in the US, but are not FDA-approved for human use outside of specific medical applications. Always consult a healthcare provider before use.

New to peptides?

Take our Peptide Match tool to find the best peptide for your goals. You can also read our Complete Guide to Peptides to learn the basics.

Scientific Sources

The following peer-reviewed studies and official resources provide additional scientific context for this peptide:

Kisspeptin Research Articles

dosing

Kisspeptin Dosage Chart: 125mcg Daily Before Bed

Kisspeptin-10 and kisspeptin-54 need different dosing strategies. Covers the 125mcg daily protocol, pulsatile timing, and 30-day cycling.

side-effects

Kisspeptin Side Effects: HPG-Axis Trial Data

Trial reports describe clean safety. Community data adds brief mood and libido shifts. Full safety breakdown.

guides

Buy Kisspeptin: Compare 3 Vendors, From $29

Compare 3 Kisspeptin vendors side by side: from $29 a vial, best value $3.90/mg. Codes save up to 50%. Vial sizes, COA status, real cost per week.

results

Kisspeptin Results: Week-by-Week Timeline

Acute libido shifts within hours, HPG-axis trends over weeks. Two timelines that matter, what trials documented at each stage, and what doesn't happen.

Compare Kisspeptin to alternatives

Side-by-side mechanism, dose, half-life, and vendor pricing.

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Disclosure: we may earn affiliate commission from qualifying purchases. Educational information only — not medical advice.