pepdex
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№ 032

Kisspeptin-10

Upstream of the entire HPG axis. Triggers the natural cascade of GnRH → LH → testosterone. Different lever than the melanocortin libido peptides.

Libido
Evidence: Moderate
Half-life
~28 minutes
Route
Subcutaneous
Cycle
Short bursts; not for chronic use
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 & legality
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
Not classified

Not formally categorized in the FDA bulks lists.

WADA
Not listed
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.

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

25-100 mcg sub-q, 1-2x daily during short courses.

Stacks well with

Standalone in research contexts
Sometimes paired with HCG in fertility / post-cycle protocols

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

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

Educational only. User-specific dosing is between you and a qualified provider.

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 banned by WADA?+
Kisspeptin-10 is not currently on the WADA prohibited list.
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?+
25-100 mcg sub-q, 1-2x daily during short courses.
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.

More in Libido

№ 012
PT-141 (Bremelanotide)

Melanocortin agonist. FDA-approved as Vyleesi for female sexual dysfunction. Used off-label for libido in both sexes.