Side-by-side · Research reference

Kisspeptin-10vsMGF

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

BAnimal-StrongHUMAN-REVIEWED14/55 cited

Kisspeptin-10

Neuropeptide · GPR54 Agonist

GnRH pulse generatorPrimary roleSilva 2026

Phase 1/2Clinical stage

GPR54/Kiss1RTarget receptorRønnekleiv 2026

IV / SQ · Investigational

MGF

IGF-1Ec Splice Variant · Muscle-Specific

IGF-1EcSplice variantArmakolas 2016

24-AASynthetic E-domain

Animal onlyHuman evidence

SQ · Research context only

01Mechanism of Action

Parameter

Kisspeptin-10

MGF

Primary target

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

Satellite cells (Pax7+) in skeletal muscleMoore 2018

Pathway

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

Mechanical stress → IGF-1Ec mRNA upregulation → Local E-domain peptide release → Satellite cell activation

Downstream effect

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

Satellite cell proliferation, myoblast differentiation, muscle fiber repair

Feedback intact?

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

—

Origin

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

Alternative splicing of IGF-1 gene (exons 4-6) produces IGF-1Ec precursor; E-domain cleaved post-translationallyArmakolas 2016 Vassilakos 2017

Antibody development

—

02Dosage Protocols

Parameter

Kisspeptin-10

MGF

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

Animal models + in vitro only

Half-life

Short (minutes)

Rapid clearance; pulsatile dosing mimics physiological GnRH pulse frequency.

—

Synthetic peptide

—

24-amino-acid E-domain sequence

Corresponds to human IGF-1Ec exons 4-6 region.

Rodent cardiac model

—

200 μg/kg via peptide-eluting microstructures

Post-MI injection; improved ejection fraction by 8 weeks.

Acute delivery (mouse MI)

—

Single bolus within 12 hrs post-infarctionShioura 2014

Delayed decompensation; no human protocol established.

Human evidence

—

None — no published clinical trials

All dosing extrapolated from animal models.

Detection in doping

—

Full-length MGF detected via LC-MS in illicit productsThevis 2014

WADA-prohibited since 2005; no therapeutic indication.

04Side Effects & Safety

Parameter

Kisspeptin-10

MGF

Ovarian hyperstimulation

Theoretical risk with supraphysiological dosing in fertility protocols

—

Headache

Mild, reported in early-phase trials

—

Nausea

Transient GI symptoms with IV bolus

—

Hot flashes

Vasomotor symptoms from LH surge

—

Injection site reaction

Erythema, mild discomfort (SQ route)

—

Human safety data

—

None — no clinical trials published

Theoretical IGF-1 axis risk

—

Chronic IGF-1Ec overexpression linked to cancer progression (prostate, colorectal, breast)

Tumor promotion

—

IGF-1Ec overexpressed in osteosarcoma, colorectal polyps with dysplasia, endometrial cancer

Antibody development

—

Unknown — no longitudinal human exposure data

Local injection reaction

—

Presumed similar to other peptides (erythema, induration) — no direct evidence

Dysregulated expression with age

—

Older adults (70+ yrs) show blunted IGF-1Ec response post-exercise vs youngMoore 2018

Absolute Contraindications

Kisspeptin-10

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

MGF

·Active malignancy or history of IGF-1-sensitive cancers (prostate, colorectal, breast, osteosarcoma)
·No established therapeutic use — investigational only

Relative Contraindications

Kisspeptin-10

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

MGF

·Family history of IGF-1-axis malignancies
·Use outside research setting

05Administration Protocol

Parameter

Kisspeptin-10

MGF

1. Reconstitution (if lyophilized)

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

MGF (E-domain peptide) has no approved clinical protocol. All published data derive from animal models or in vitro experiments.

2. Route selection

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

Commercially available MGF corresponds to the 24-amino-acid human E-domain (hEc). Rodent E-domain (Eb) is structurally distinct and not interchangeable.

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.

Rodent studies used peptide-eluting polymeric microstructures (cardiac) or direct intramuscular injection. Routes and doses non-translatable to humans.Peña 2015 Shioura 2014

4. Monitoring

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

MGF peptides prohibited in sport since 2005. Detection via LC-MS established for full-length MGF products.Thevis 2014

5. Storage

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

Any human use falls outside approved medical practice and regulatory frameworks. No safety or efficacy data exist.

06Stack Synergy

Kisspeptin-10

— no documented stacks

MGF

+ BPC-157

Multi-pathway

View BPC-157 →

MGF activates satellite cells for muscle fiber repair; BPC-157 promotes angiogenesis, collagen synthesis, and tendon healing via distinct pathways (VEGF, FAK, integrin signaling). Theoretical synergy in post-injury contexts combines myogenic (MGF) and stromal (BPC-157) repair mechanisms. Both lack human validation.

MGF: No established dose
BPC-157: 250–500 mcg SQ near injury site
Context: Animal models only
Primary benefit: Theoretical multi-tissue repair (muscle + tendon/ligament)

+ TB-500

Moderate

View TB-500 →

TB-500 (thymosin beta-4 fragment) enhances actin polymerization, cell migration, and angiogenesis—complementary to MGF satellite cell activation. Both upregulated post-injury; combined use presumed additive for muscle regeneration in preclinical models.

MGF: No established dose
TB-500: 2–5 mg SQ weekly
Context: Animal models only
Primary benefit: Satellite cell activation + enhanced migration/angiogenesis