What is the difference between Gonadorelin and Melanotan II?

Gonadorelin: Synthetic GnRH that binds pituitary GnRH receptors; pulsatile dosing stimulates LH/FSH release; used to maintain HPG axis during TRT Melanotan II: Synthetic melanocortin receptor agonist (MC1R-MC5R); activates MC4R for erectile function/libido; MC1R for melanogenesis; MC3R for appetite suppression

Is Gonadorelin FDA approved?

Gonadorelin is not evaluated or approved by the FDA. It is discussed for research and educational purposes only, not as medical guidance.

How is Gonadorelin administered in research settings?

In research settings, Gonadorelin is typically administered via the subcutaneous or intravenous routes. PeptideBase does not provide dosing or administration instructions.

How is Melanotan II administered in research settings?

In research settings, Melanotan II is typically administered via the subcutaneous or intranasal routes. PeptideBase does not provide dosing or administration instructions.

Home›Research›Compare›Gonadorelin vs Melanotan II

Peptide Comparison

Gonadorelin vs Melanotan II

Name: Gonadorelin vs Melanotan II — Per-mg Price Comparison
Creator: PeptideBase
License: https://peptidebase.io/terms

Both are Reproductive & Hormonal peptides.

Gonadorelin

GnRH

Sexual HealthNot EvaluatedCompoundable

Half-life: ~2-4 minutes

26 providers listed

Full Gonadorelin profile →

Melanotan II

MT-II

Sexual HealthResearch Only

Half-life: ~1-2 hours

94 providers listed

Full Melanotan II profile →

Bottom line

Gonadorelin carries stronger published evidence (Meta-analysis, 3 key studies) than Melanotan II (RCT, 2); both are research compounds.

Quick Verdict

Gonadorelin

Half-life

~2-4 minutes

Melanotan II

Half-life

~1-2 hours

Which One Should You Choose?

Your goal	Better option
Stronger clinical evidence	Gonadorelin
Less frequent dosing (longer half-life)	Melanotan II
Lower typical price per mg	Melanotan II
More provider options (26 vs 94)	Melanotan II

Research summary only — not medical advice. Consult a qualified provider before making any decisions.

Side-by-Side Comparison

Gonadorelin

Melanotan II

Mechanism Family

Reproductive & Hormonal

Half-life

~2-4 minutes

~1-2 hours

FDA Status

not evaluated

nomination withdrawn

Admin Routes

subcutaneous, intravenous

subcutaneous, intranasal

Availability

Compoundable

Research Only

Providers

26 listed

94 listed

Avail. Notes

Previously FDA-approved as Factrel (NDA 017019). Voluntarily discontinued by manufacturer. Included on the FDA 503B outsourcing-facility bulk-substances list (Category 1), not the 503A pharmacy list. Prescription compounded product.

Not FDA-approved. Not to be confused with bremelanotide (PT-141/Vyleesi, which is approved). No NDA. Sold illicitly as research chemical. FDA warns against injectable tanning products.

Research Evidence

Gonadorelin

Meta-analysis · 3 key studies · most recent 2026

Melanotan II

RCT · 2 key studies · dated evidence base — most recent 2014

Research Citations

Gonadorelin

Meta-analysis2018 · Fertility and Sterility

Efficacy and safety of pulsatile gonadotropin-releasing hormone therapy among patients with idiopathic and fu…

Animal2026 · J Reprod Dev

Effect of post-insemination GnRH analogue administration on pregnancy rates in repeat-breeder cows: compariso…

Animal2026 · J Dairy Sci

Increasing gonadorelin hydrochloride dose at the first GnRH of breeding Ovsynch enhances luteinizing hormone…

Melanotan II

RCT2000 · Urology

Effect of an alpha-melanocyte stimulating hormone analog on penile erection and sexual desire in men with org…

Review2014 · Expert Opinion on Investigational Drugs

Melanocortin receptor agonists in the treatment of male and female sexual dysfunctions: results from basic re…

About Gonadorelin

Synthetic GnRH that binds pituitary GnRH receptors; pulsatile dosing stimulates LH/FSH release; used to maintain HPG axis during TRT

Research Areas

pulsatile LH and FSH stimulation from the pituitarytesticular function and testosterone production maintenancefertility preservation alongside TRT (FSH pathway intact)hypothalamic-pituitary axis restoration in hypogonadism

About Melanotan II

Synthetic melanocortin receptor agonist (MC1R-MC5R); activates MC4R for erectile function/libido; MC1R for melanogenesis; MC3R for appetite suppression

Research Areas

central MC4R-mediated sexual arousal and erectile functionskin tanning via MC1R melanogenesis activationappetite suppression (MC4R hypothalamic pathway)significant side effect profile — nausea, flushing, pigmentation (vs cleaner successor PT-141)

Safety Profile

Information below reflects published research data only — not medical advice. Consult a qualified provider before use.

Gonadorelin

Reported (Unverified — Pending Clinical Review)

continuous high-dose (causes receptor downregulation)

No established clinical contraindications

Suggested Monitoring

Total testosteroneLHFSHEstradiol (E2)SHBGProlactin

Standard reproductive endocrinology panels establish HPG axis baseline. LH and FSH confirm pituitary response to gonadorelin; testosterone, E2, and SHBG reflect downstream gonadal output.

Melanotan II

Warnings & Cautions

No FDA approval — investigationalMelanoma / dysplastic nevi — caution (melanocyte stimulation)Cardiovascular effectsPriapism (males)Known hypersensitivity

Class-based (investigational)

Used Together?

Melanotan II

Antihypertensive medications
Research notes that Melanotan II may influence cardiovascular function via melanocortin receptor activation. Combined use with antihypertensive medications may require blood pressure monitoring. Consult your prescriber before combining.

Price (per mg)

Gonadorelin

$8.45/mg

$6.90 – $14.95 range

10 vendors

View price index →Find providers →

Melanotan II

$4.00/mg

$3.45 – $4.36 range

37 vendors

View price index →Find providers →

Find Providers

Where to source these peptides

Providers offering

Gonadorelin

26 listed

Browse directory →

Providers offering

Melanotan II

94 listed

Browse directory →

PeptideBase lists providers for educational research purposes only. Always consult a qualified healthcare professional before obtaining or using any peptide.

More Reproductive & Hormonal Comparisons

Browse all peptides →

Educational research tools — not medical advice.

Cite this page

Data last updated August 26, 2026

Free to reference and republish with attribution to PeptideBase. Choose a format:

PeptideBase. (2026). Gonadorelin vs Melanotan II — Per-mg Price Comparison. Retrieved September 11, 2026, from https://peptidebase.io/peptides/compare/gonadorelin/melanotan-ii

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