Melanotan II

What Is Melanotan II?

Melanotan II is a synthetic analog of alpha-melanocyte stimulating hormone (α-MSH), the same natural hormone family as PT-141 (bremelanotide). However, Melanotan II is a full, potent agonist at all melanocortin receptors including MC1R (skin tanning), MC3R and MC4R (sexual function and appetite suppression), making it more potent and less selective than PT-141.

MT-II was developed at the University of Arizona in the early 1990s. It produces skin darkening (tanning) without UV exposure, aphrodisiac effects (including spontaneous erections in men), and appetite suppression. These effects all stem from broad melanocortin receptor activation. PT-141 was later developed as a more selective, safer version.

Melanotan II is NOT FDA-approved and has NOT completed clinical trials. It is widely sold online as a 'research chemical' and used by individuals for tanning and sexual enhancement. Multiple regulatory agencies worldwide have issued warnings about MT-II due to safety concerns. It has been removed from some markets and is considered an adulterated drug product when sold without prescription.

What The Research Says

Phase 1 and early Phase 2 trials demonstrated the expected pharmacological effects: skin pigmentation, spontaneous erections (in men), nausea, facial flushing, and appetite suppression. Development was halted and pivoted to the more selective PT-141 (bremelanotide).

Safety concerns that halted development include: uncontrolled activation of multiple melanocortin receptors, potential for unwanted pigmentation changes (including moles), nausea and vomiting, stretch penile erections ('undesired erections'), blood pressure effects, and unknown long-term risks including potential for melanocytic changes.

📚 Key Reference: PMID: 10570947 (Melanotan II Phase 1)

Common Uses

• Tanning (research — not approved)
• Sexual dysfunction (research — not approved; PT-141 is the approved alternative)

Important Safety Information

⚠️ SIGNIFICANT SAFETY CONCERNS. Melanotan II sold online as a research chemical has NO quality standards, unverified purity, and unknown contaminants. Adverse events reported include melanoma concerns, uncontrolled erections (priapism risk), severe nausea, hypertension, and melanocytic changes. The FDA has issued multiple warnings. If seeking sexual enhancement or tanning effects, consult a provider about FDA-approved alternatives (PT-141/Vyleesi for sexual desire).

Questions To Ask Your Provider

1. Why is Melanotan II being considered over FDA-approved PT-141 (Vyleesi)?
2. What safety monitoring would be in place?
3. Has a dermatologist evaluated any moles or pigmented lesions before treatment?
4. Where is this sourced and what purity testing has been done?

Regulatory Status

NOT FDA-approved. NOT approved in most countries. FDA has issued warnings against use. The Australian TGA has explicitly warned against MT-II. It is frequently sold illegally online. Patients should be very cautious about any provider offering this.