Melanotan II vs PT-141.
Editor's Note
Both Melanotan II and PT-141 (Bremelanotide) are melanocortin receptor agonists. PT-141 is the FDA-approved derivative specifically targeting sexual function. Melanotan II has broader receptor activity including tanning effects.
Quick Verdict
Melanotan II is a melanocortin agonist primarily researched for tanning, libido enhancement, while PT-141 is a melanocortin agonist studied for sexual arousal, libido. A key distinction: PT-141 has FDA approval status.
Side-by-Side Analysis
| Dimension | Melanotan II | PT-141 |
|---|---|---|
| Category | Melanocortin Agonist | Melanocortin Agonist |
| Mechanism | MC4R activation. | Central melanocortin pathway. |
| Half-Life | ~1 hours | ~2.7 hours |
| Route | SubQ | SubQ |
| Typical Dose | 250–250 mcg | 1500–1500 mcg |
| Frequency | 7x/wk | 2x/wk |
| Evidence Level | Moderate | Very Strong |
| Indexed Studies | 20+ indexed | 19+ indexed |
| FDA Status | Research Only | Approved |
| Lowest Price | $40.00 / 10mg via Ascension Peptides | $45.00 / 10mg via Ascension Peptides |
| Per-mg Cost | $4.00/mg | $4.50/mg |
Mechanism of Action Comparison
How Melanotan II Works
Melanotan II Melanotan II is a synthetic melanocortin analog studied for stimulating skin tanning, suppressing appetite, and increasing sexual arousal, though it carries significant safety concerns.
MC4R activation. Non-selectively activates melanocortin receptors to stimulate melanin production, suppress appetite, and increase sexual arousal.
How PT-141 Works
PT-141 PT-141 (Bremelanotide) is an FDA-approved melanocortin agonist prescribed as Vyleesi for hypoactive sexual desire disorder in premenopausal women, also studied for male erectile dysfunction.
Central melanocortin pathway. Activates MC4R in the CNS to stimulate sexual desire through brain pathways rather than vascular effects.
Key Mechanistic Difference
Both Melanotan II and PT-141 belong to the Melanocortin Agonist class, but differ in their specific molecular targets and pharmacokinetic profiles.
Research Evidence
Melanotan II
20 studies- Melanotan II tanning and erectile effects Phase IDorr et al. (J. Investigative Dermatol.): Phase I trial in normal male volunteers confirming tanning activity and sponta…Moderate
- Melanotan II as potent initiator of penile erectionWessells et al. (J. Urology): Double-blind study showing MT-II initiates erection in men with erectile dysfunction even …Moderate
- Melanotan II as skin cancer chemopreventive peptideHadley & Dorr (Peptides): Review of MT-II as potential chemopreventive agent for UV-induced skin cancer through enhanced…Preclinical
PT-141
19 studies- PT-141 (Bremelanotide) for hypoactive sexual desire Phase 3Kingsberg et al. (Obstet. & Gynecol.): Two identical Phase 3 RECONNECT trials showing bremelanotide significantly improv…Very Strong
- Bremelanotide Phase 3 efficacy and safety in HSDDClayton et al.: Phase 3 data confirming statistically significant improvements in desire metrics with favorable safety p…Very Strong
- PT-141 induces erection in men with erectile dysfunctionDiamond et al.: Double-blind, placebo-controlled study showing PT-141 induces significant erectile response at >7mg dose…Strong
Vendor Pricing
· Affiliate links · Prices verified 2026Melanotan II
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Frequently Asked Questions
Can I take Melanotan II and PT-141 together?▼
Use caution. Melanotan II and PT-141 have overlapping mechanisms that may require careful dosing adjustment when used concurrently. Consult published research protocols before combining.
Which has more research evidence — Melanotan II or PT-141?▼
Melanotan II has 20 indexed studies (highest evidence: Moderate). PT-141 has 19 indexed studies (highest evidence: Very Strong). Melanotan II has a more extensive research base.
What is the price difference between Melanotan II and PT-141?▼
At current verified vendor prices, Melanotan II starts at $4.00/mg while PT-141 starts at $4.50/mg. Prices vary by vendor and vial size — see the full vendor comparison below.
Is Melanotan II or PT-141 FDA-approved?▼
PT-141 has FDA approval (or is derived from an FDA-approved compound). Melanotan II is a research compound without FDA approval for human use. FDA status reflects regulatory evaluation — not necessarily superiority for all research applications.
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Research Use Only — Not Medical Advice
This comparison is provided for educational and research purposes only. It does not constitute medical, prescribing, or treatment advice. Clinical data cited here is sourced from published peer-reviewed trials and FDA labels. Consult a qualified healthcare professional before making any decisions about medications or research compounds. PeptiDex is an informational resource and does not sell pharmaceutical products.