Melanotan-2 vs PT-141: How the Two Melanocortin Compounds Differ

PT-141 (bremelanotide) is structurally derived from Melanotan-2, but the two differ in receptor focus and regulatory status. This guide explains the distinction.

7 min read · Published 2026-06-23

Melanotan-2 vs PT-141: At a Glance

PT-141 (bremelanotide) is structurally derived from Melanotan-2. Both are melanocortin-receptor agonists, but they are studied for different receptor emphases and have different regulatory standing.

Research use only. Both compounds are supplied for in-vitro laboratory research. Neither is a medicine, and neither is for human or veterinary consumption, administration, or therapeutic use.

How They Differ — Receptor Focus

Melanotan-2 is a broad melanocortin agonist studied in pigmentation contexts. PT-141 is studied with emphasis on the melanocortin-4 receptor (MC4R), a central-nervous-system target. The structural relationship is close, but the research focus differs.

Regulatory Status

Melanotan-2 is not approved and authorities have warned against unlicensed products sold for human use. PT-141, as bremelanotide (Vyleesi), is FDA-approved in the US for a specific indication under medical supervision, but is not licensed for general use in the UK. Research-grade material of either is supplied for laboratory use only.

Sourcing for Research

See our individual guides and our UK legality overview. View Melanotan-2 and PT-141 product details.

Frequently Asked Questions

What is the difference between Melanotan-2 and PT-141?

PT-141 (bremelanotide) is derived from Melanotan-2 but is studied with emphasis on the MC4R receptor and has an approved medical form (Vyleesi) in the US; Melanotan-2 is a broader melanocortin agonist with no approval.

Is Melanotan-2 or PT-141 approved?

PT-141 (as bremelanotide/Vyleesi) is FDA-approved in the US for a specific indication; Melanotan-2 is not approved anywhere. Neither is licensed for general UK use, and research-grade material is for laboratory use only.

Are they the same compound?

No. They are structurally related but distinct molecules with different receptor emphasis and regulatory status.

Related Guides

• What Is PT-141? Melanocortin Peptide Research Guide
• What Is Melanotan-2? Melanocortin Peptide Research Guide
• Are Research Peptides Legal in the UK? (2026 Complete Guide)

Browse research peptides or read more research guides.