What is the difference between Gonadorelin and Melanotan II?

Gonadorelin (Gonadorelin (GnRH)) is graded A and is FDA-approved (Factrel) historically for diagnostic GnRH stimulation; off-label use in TRT to preserve testicular function. Melanotan II (Melanotan II (MT-II)) is graded C+ and is Not FDA-approved — sold illegally as cosmetic; FDA warning letters issued. They are commonly compared because they share the categories: sexual-health.

Which has stronger clinical evidence — Gonadorelin or Melanotan II?

On our internal evidence scale, Gonadorelin is A and Melanotan II is C+. A+ indicates large RCTs plus FDA approval; C indicates primarily preclinical or anecdotal evidence.

What is the typical dose of Gonadorelin vs Melanotan II?

Gonadorelin: 100–500 mcg every 1–3 days (subcutaneous, pulsatile). Melanotan II: 0.25–1 mg daily during loading, then maintenance (subcutaneous). Always work with a licensed clinician — peptide dosing should be individualized.

Gonadorelin vs Melanotan II

Both Gonadorelin and Melanotan II are used for sexual-health. Here's how their evidence, dosing, and regulatory status actually compare.

Gonadorelin

Evidence A

Gonadorelin (GnRH)

Synthetic GnRH used clinically to stimulate LH/FSH release. In testosterone replacement therapy, used pulsatile to preserve testicular size and fertility instead of hCG.

View full Gonadorelin profile →

Melanotan II

Evidence C+

Melanotan II (MT-II)

A non-selective melanocortin agonist (MC1R/MC3R/MC4R) that produces tanning and erection effects. Significant safety concerns including melanoma case reports.

View full Melanotan II profile →

Side-by-Side

Attribute	Gonadorelin	Melanotan II
Evidence Grade	A	C+
FDA Status	FDA-approved (Factrel) historically for diagnostic GnRH stimulation; off-label use in TRT to preserve testicular function	Not FDA-approved — sold illegally as cosmetic; FDA warning letters issued
Typical Dose	100–500 mcg every 1–3 days (subcutaneous, pulsatile)	0.25–1 mg daily during loading, then maintenance (subcutaneous)
Clinics Indexed	156	18
Categories	sexual-health, fertility	skin, sexual-health

Key reported benefits — Gonadorelin

✓LH/FSH stimulation
✓Testicular preservation on TRT
✓Fertility support

Key reported benefits — Melanotan II

✓UV-independent tanning
✓Erectile effect (off-label)

Educational use only

This comparison is for educational purposes and not medical advice. Peptide selection should be made with a licensed medical professional based on your individual goals, health history, and current evidence quality.

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