Side-by-side · Research reference

Kisspeptin-10vsSemax

Side-by-side comparison across mechanism, dosage, evidence, side effects, administration, and stack synergies. Citations on every claim where available.

APhase 2HUMAN-REVIEWED10/41 cited

BHuman-MechanisticAUTO-DRAFTED12/39 cited

Kisspeptin-10

Neuropeptide · GPR54 Agonist

GnRH pulse generatorPrimary roleSilva 2026

Phase 1/2Clinical stage

GPR54/Kiss1RTarget receptorRønnekleiv 2026

IV / SQ · Investigational

Semax

Cognitive enhancer · Russian Pharma

200–600 mcg/doseIntranasalKaplan 2017

HumanMechanisticKaplan 2017

~30 minOnset

Intranasal · 2–3×/day during cognitive demand

01Mechanism of Action

Parameter

Kisspeptin-10

Semax

Primary target

GPR54/Kiss1R on hypothalamic GnRH neuronsRønnekleiv 2026 Collado-Sole 2026

BDNF / NGF expression + monoamine modulationKaplan 2017

Pathway

Kisspeptin → GPR54 activation → GnRH neuronal depolarization → Pulsatile GnRH release → Pituitary LH/FSH secretionLages 2026 Rønnekleiv 2026

↑ BDNF + NGF synthesis + 5-HT modulation → neuroplasticity + anxiolysis + cognitive enhancementKaplan 2017

Downstream effect

Pulsatile LH surge, FSH elevation, gonadal steroidogenesis, gametogenesis initiationLages 2026

Improved memory + attention; reduced anxiety; neuroprotection in ischemiaKaplan 2017

Feedback intact?

Yes — integrates estradiol, leptin, and IGF-1 signals to modulate HPG axisSilva 2026 Rønnekleiv 2026

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Origin

C-terminal decapeptide of KISS1 gene product; retains full biological activity of longer kisspeptin isoforms

Synthetic 7-AA peptide derived from ACTH(4-7) with C-terminal Pro-Gly-Pro stabilising tailKaplan 2017

Antibody development

—

02Dosage Protocols

Parameter

Kisspeptin-10

Semax

Clinical trial dose

Phase 1/2 investigational

Dosing protocols vary by indication (hypothalamic amenorrhea, IVF trigger).

—

Route

IV or SQ administration

IV preferred in controlled trials for precise pulsatile delivery.

—

Evidence basis

Phase 1/2 trials

Human-mechanistic + Russian clinicalKaplan 2017

Half-life

Short (minutes)

Rapid clearance; pulsatile dosing mimics physiological GnRH pulse frequency.

Short plasma; CNS effect lasts ~3–6 hr

Standard dose

—

200–600 mcg / dose intranasalKaplan 2017

Frequency

—

2–3× per day during cognitive demand

Lower / starter dose

—

100 mcg / dose

Duration

—

10–14 day cycles, repeated PRN

Reconstitution

—

Pre-formulated nasal spray (commercial); research vial: bacteriostatic water

Timing

—

Morning + early afternoon

04Side Effects & Safety

Parameter

Kisspeptin-10

Semax

Ovarian hyperstimulation

Theoretical risk with supraphysiological dosing in fertility protocols

—

Headache

Mild, reported in early-phase trials

Uncommon, transient

Nausea

Transient GI symptoms with IV bolus

—

Hot flashes

Vasomotor symptoms from LH surge

—

Injection site reaction

Erythema, mild discomfort (SQ route)

—

Nasal irritation

—

Mild burning or congestion (transient)

Sleep disruption

—

Late-day dosing may interfere with sleep

Long-term safety

—

Limited Western RCT data

Pregnancy / OB

—

Avoid

Absolute Contraindications

Kisspeptin-10

·Active pregnancy
·Hormone-sensitive malignancy (breast, ovarian, endometrial)

Semax

·Pregnancy / breastfeeding

Relative Contraindications

Kisspeptin-10

·Polycystic ovary syndrome (PCOS) without monitoring
·Uncontrolled thyroid dysfunction

Semax

·Active psychiatric instability
·Concurrent strong stimulants

05Administration Protocol

Parameter

Kisspeptin-10

Semax

1. Reconstitution (if lyophilized)

Reconstitute with sterile water or saline per protocol. Gently swirl — do not shake. Solution should be clear and colorless.

Pre-formulated nasal spray (commercial) or research vial reconstituted with bacteriostatic water.

2. Route selection

IV infusion for pulsatile delivery in clinical trials; SQ for outpatient protocols. IV allows precise temporal control of GnRH pulse frequency.

Intranasal — 2–3 sprays per nostril per dose. Tilt head slightly back.

3. Timing

Pulsatile dosing (e.g., every 60–90 min) mimics physiological GnRH pulse generator. Single-bolus protocols used for LH surge induction in fertility research.

Morning + early afternoon. Avoid evening (sleep disruption).

4. Monitoring

Serial LH, FSH, estradiol measurements to confirm HPG axis activation. Ultrasound monitoring for ovarian response in fertility applications.

Refrigerate after reconstitution; light-protected.

5. Storage

Lyophilized: store at 2–8 °C, light-protected. Reconstituted: refrigerate, use within 24–48 hours per protocol.

Cycle on/off to avoid neurochemical adaptation.

06Stack Synergy

Kisspeptin-10

— no documented stacks

Semax

+ Selank

Moderate

View Selank →

Semax (cognitive enhancer, BDNF/NGF) and Selank (anxiolytic + immune) form the canonical Russian "neuro stack" — both intranasal peptide bioregulators with complementary axes. Semax for cognitive demand; Selank for stress mitigation.

Semax: 200–600 mcg intranasal · morning + afternoon
Selank: 150–300 mcg intranasal · midday + early evening
Primary benefit: Cognitive enhancement + stress mitigation

Kaplan 2017 Zaderej 2014