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№ 033

Kisspeptin-10

Kick-starts your body's own testosterone production at the very top. It sits upstream of the entire HPG axis, triggering the natural cascade of GnRH → LH → testosterone, a different lever than the melanocortin libido peptides.

Libido
Evidence: Moderate

Kisspeptin-10: Kick-starts your body's own testosterone production at the very top. It sits upstream of the entire HPG axis, triggering the natural cascade of GnRH → LH → testosterone, a different lever than the melanocortin libido peptides. Kisspeptin sits at the very top of the chain that produces testosterone.

FDA ⓘ
Not approved
WADA
Banned
Typical dose
25-100 mcg sub-q
Half-life ⓘ
~4 minutes (kisspeptin-10)
Route ⓘ
Subcutaneous
Schedule
As needed or 1-2x daily during a short cycle
In plain English

Kisspeptin sits at the very top of the chain that produces testosterone. When you inject it, your body's own testosterone-making cascade fires off naturally. It's a different lever than PT-141, kisspeptin is upstream hormones, PT-141 is melanocortin pathway.

Status & legalityWhat do these mean? →
Natty? ⓘ
Grey area

Modulates your own HPG axis rather than introducing exogenous testosterone, but federations differ.

FDA ⓘ
Not approved

Not FDA approved. In clinical investigation for fertility / HPG-axis applications.

Compounding ⓘ
Category 2

FDA places kisspeptin-10 in Category 2 of the 503A nominations, one of only six substances in that category. Its concern is immunogenicity risk by certain routes, peptide-impurity and characterization complexity, and having no or only limited safety information for the proposed routes, which leaves FDA unable to say whether it would harm humans. Category 2 sits outside FDA's Category 1 interim policy, so FDA has said it would consider action under its general enforcement policies. It is not on the 503A bulks list.

WADA ⓘ
Banned (S2)

Explicitly named on the 2026 WADA Prohibited List under S2.2.1 (testosterone-stimulating peptides), prohibited in male athletes at all times. Not restricted in female athletes.

Prescribed ⓘ

Used in some fertility-medicine research contexts.

Who it's for

  • →Users with low LH / suppressed HPG axis post-cycle
  • →Fertility-adjacent contexts under medical guidance
  • →Researchers exploring HPG-axis modulation

What to expect

  1. Week 1

    LH and testosterone bumps within hours of dose. Subjective libido response varies.

  2. Week 4

    If on a short course, complete it. Effects don't compound the way they do with daily peptides.

  3. Week 8

    Off-cycle.

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How it works (mechanism)

Activates the kisspeptin receptor (KISS1R / GPR54) on hypothalamic neurons. The most upstream signal in the HPG axis, kisspeptin tells the hypothalamus to release GnRH, which tells the pituitary to release LH/FSH, which drives gonadal testosterone production.

Dosing protocol

Members only

Stacks well with

Members only

Side effects

01Generally well tolerated
02Mild headache rarely
03Brief facial flush

When NOT to use

  • ⚠Pregnancy
  • ⚠Active reproductive cancer

Bloodwork to monitor

  • • LH, FSH, total testosterone if running for HPG-axis purposes

Common mistakes

  • • Treating it like PT-141 (different mechanism, kisspeptin is upstream HPG, PT-141 is melanocortin)
  • • Running it chronically
  • • Stacking with multiple HPG modulators without monitoring

What it actually is

Kisspeptin-10 is a fragment of kisspeptin, the hormone that sits at the very top of the reproductive hormone cascade. It is the switch that starts puberty: without functioning kisspeptin signalling, the whole axis never turns on. It is a genuinely major piece of endocrinology with a large research literature — 34 randomised-trial records and 61 human-trial records indexed — most of it in fertility medicine rather than in the libido context people buy it for.

Kisspeptin neurons in the hypothalamus release kisspeptin onto GnRH neurons, which then release GnRH in pulses. GnRH tells the pituitary to release LH and FSH, which tell the testes or ovaries to make testosterone or oestrogen and gametes. Kisspeptin is therefore upstream of everything — a completely different lever from PT-141, which acts on desire pathways in the brain and does nothing to hormones. Kisspeptin-10 is cleared in about four minutes on intravenous dosing, which is why it produces a pulse rather than sustained stimulation. Subcutaneous pharmacokinetics are not established.

Forms, and which is which

Lyophilised powder, subcutaneousHow non-trial use happens

Buyer reconstitutes. Research-chemical supply with unverified identity.

Verdict: The common route, unregulated.

Clinical trial and research supplyThe studied context

Used in fertility medicine research, including as a trigger in IVF protocols where it carries a lower risk of ovarian hyperstimulation than conventional triggers.

Verdict: Where the real evidence sits.

Kisspeptin-54The longer fragment

A longer form used in some research protocols with different kinetics.

Verdict: A different molecule, not a stronger dose.

HCG or SERMsThe established axis interventions

Worth being precise: HCG does not restart the axis, it substitutes for LH at the gonad and bypasses the suppressed upstream signal. SERMs act on the pituitary feedback. Both have real clinical use.

Verdict: The options with actual clinical evidence.

What it is claimed to do, graded

Stimulates LH release and the reproductive axisStrong

Thoroughly established physiology across a large human research literature. The magnitude depends on dose, route and where someone is in their cycle or axis state, so reliable describes the mechanism rather than a fixed response.

Useful as an IVF trigger with lower hyperstimulation riskModerate

A real and promising research application — and the trigger evidence is largely for kisspeptin-54, a longer form, not the kisspeptin-10 sold under this name.

Raises testosterone acutelyModerate

Demonstrated acutely in human studies, and the response depends on an intact axis below the hypothalamus. Whether repeated dosing produces a sustained rise is a different question and much less clear.

Increases libido and sexual desireLimited

The reason most people in this space buy it. Some human imaging work suggests effects on sexual and emotional brain processing. It is not established as a libido treatment.

Is a safe long-term testosterone strategyNone shown

Continuous stimulation of a pulsatile system tends to desensitise it — the same principle GnRH agonists exploit to shut the axis DOWN in prostate cancer. Chronic use is unstudied and the theoretical risk runs in the wrong direction.

Grades describe how much human evidence exists for that specific claim, not whether it will work for you or whether it is safe.

Pros and cons

Pros
  • • A genuinely major hormone with a large, high-quality human research literature
  • • Acts upstream of the whole axis, so it works with the body's own pulsatile signalling
  • • Very short half-life, so a mistake clears quickly
  • • Well tolerated in the human research
Cons
  • • The large literature is fertility endocrinology, not libido enhancement
  • • Continuous dosing risks desensitising the very system it stimulates
  • • Not approved for any use
  • • Research-chemical supply with unverified identity
  • • Effects on testosterone are acute and pulse-like, which is not what most buyers expect

When to stop

  • • Any sign of hormone excess: acne flare, mood changes, breast tenderness
  • • You have been running it continuously rather than in short courses
  • • Testicular pain or swelling
  • • Any new hormone-sensitive cancer diagnosis

Interactions

GnRH agonists or antagonistsAvoid

Directly opposing or overlapping action on the same axis.

Exogenous testosteroneCaution

Testosterone suppresses the axis kisspeptin stimulates. Working against each other.

HCGMonitor

Both aim to support the axis, at different points. No data on the combination.

Active reproductive cancerAvoid

Stimulating sex hormone production where a hormone-sensitive tumour may exist.

Continuous rather than pulsed dosingCaution

Not a drug interaction but the key practical risk: sustained stimulation of a pulsatile system can desensitise it.

Is this for you?

Probably worth reading further if
  • • People interested in the axis physiology who understand the research is fertility medicine, not libido
  • • Anyone using it in short courses rather than continuously
Skip it if
  • • You are pregnant or trying to conceive without a fertility specialist involved
  • • You have an active reproductive or hormone-sensitive cancer
  • • You are on testosterone therapy — the two work against each other
  • • You want a sustained testosterone increase; that is not what a four-minute pulse does

The one number

34 indexed randomised-trial records and 61 human-trial records, almost all in reproductive endocrinology
Pepdex evidence index — counts are indexed PubMed records, not deduplicated trials; PubMed query for kisspeptin

Sources for the claims above

Drug & supplement interactions

  • ⚠Hormone-modulating drugs (TRT, GnRH agonists/antagonists, oral contraceptives) all interact with the HPG axis kisspeptin sits at the top of
  • ⚠Use under provider guidance if you're on any HPG-axis medication
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AI Coach, live sample
Member answer
is 250mcg of bpc enough for a knee injury?
For a knee, is the standard working dose and a solid place to start. The trick with BPC is consistency, give it weeks, not days. , run it , and don't drop below , results tend to fall off under that line. If nothing's moved by week 3, that's when earns its place.
how much bac water for a 10mg reta vial?
is the standard play for a 10 mg reta vial. That gives you , clean unit math across the whole titration: on a 100-unit insulin syringe. Run instead if you want fewer, more concentrated shots. Most people titrate up over , and that mix keeps the numbers cleanest.
what should i track on bloodwork for tirzepatide?
Lipid panel, ALT/AST (liver enzymes), and an A1C, baseline before you start then every 3 months. If you've got metabolic-syndrome history, add fasting glucose and insulin so you can actually watch insulin sensitivity improve. You don't need a big hormone panel for a GLP-1.

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Frequently asked

What is Kisspeptin-10?+
Kisspeptin sits at the very top of the chain that produces testosterone. When you inject it, your body's own testosterone-making cascade fires off naturally. It's a different lever than PT-141, kisspeptin is upstream hormones, PT-141 is melanocortin pathway.
Is Kisspeptin-10 FDA approved?+
Not FDA approved. In clinical investigation for fertility / HPG-axis applications.
Is Kisspeptin-10 legal?+
Kisspeptin-10 is not FDA-approved, so there is no approved prescription version. Most supply is sold as "research only" by peptide vendors. A compounding pharmacy may only use substances the FDA permits for compounding, and many research peptides are not permitted — do not assume a compounded prescription is available. Possession is generally not criminalized but distribution without authorization may be. Verify local laws.
Is Kisspeptin-10 banned by WADA?+
Kisspeptin-10 is on the WADA prohibited list under Banned (S2). Explicitly named on the 2026 WADA Prohibited List under S2.2.1 (testosterone-stimulating peptides), prohibited in male athletes at all times. Not restricted in female athletes.
Are you still natty after taking Kisspeptin-10?+
Grey area. Modulates your own HPG axis rather than introducing exogenous testosterone, but federations differ.
Do doctors prescribe Kisspeptin-10?+
Used in some fertility-medicine research contexts.
What's the typical dose of Kisspeptin-10?+
Dosing depends on your goal, experience, and tolerance. The full Kisspeptin-10 protocol (dose, frequency, and how to titrate) is in the members section on the entry page.
What are the side effects of Kisspeptin-10?+
Common side effects include: Generally well tolerated; Mild headache rarely; Brief facial flush. Less common effects and full safety details are on the entry page.
How long until Kisspeptin-10 starts working?+
LH and testosterone bumps within hours of dose. Subjective libido response varies.
What can you stack with Kisspeptin-10?+
Kisspeptin-10 is commonly combined with complementary compounds. The full stacking protocol (what to pair, dosing, and timing) is in the members section on the entry page.
Where do people get Kisspeptin-10?+
Pepdex does not sell, ship, or recommend suppliers. Kisspeptin-10 is not FDA-approved; prescription versions require licensed clinical care, and "research only" markets carry real legal and quality risks. /coa explains how to verify a Certificate of Analysis and /guides/scam-vendor-spotting covers the red flags.
Kisspeptin-10 vs PT-141 (Bremelanotide), which is better?+
PT-141 vs Kisspeptin for libido: melanocortin pathway vs upstream HPG axis. Two different mechanisms, different use cases. Full head-to-head comparison: https://pepdex.co/compare/pt-141-vs-kisspeptin

Common questions about Kisspeptin-10

Head-to-head with Kisspeptin-10

Compare
Kisspeptin-10 vs PT-141 (Bremelanotide) →

Tracked alongside Kisspeptin-10

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More in Libido

№ 013
PT-141 (Bremelanotide)

Boosts libido and sexual desire. A melanocortin agonist, FDA-approved as Vyleesi for female sexual dysfunction and used off-label for libido in both sexes.