What Is Melanotan II?

How is Melanotan II classified and what is its structure?

Melanotan II — also written MT-2, MT2 or Melanotan 2 — is a synthetic cyclic heptapeptide analogue of alpha-melanocyte-stimulating hormone (α-MSH). An agonist is a molecule that activates a receptor; MT-II is studied as a broad, non-selective agonist across the melanocortin receptor subtypes.

It originated in medicinal-chemistry work on cyclic melanotropic peptides designed to be more stable and potent than native α-MSH, and in the literature it is grouped with other melanocortin-system research peptides.

How is Melanotan II’s mechanism studied in research?

Research into the melanocortin system characterises these receptors as follows:

• MC1R — studied for its role in melanin-pigment signalling.
• MC3R / MC4R — central melanocortin receptors investigated in energy-balance and neural-signalling research.
• MC5R — studied in exocrine and peripheral-signalling models.

Published research characterises MT-II as a potent, non-selective melanocortin receptor agonist and examines its activity across these receptor subtypes in laboratory models.

These statements describe the published scientific record; they are not claims about any effect in humans.

What kind of research has been published on Melanotan II?

Melanotan II emerged from medicinal-chemistry research on cyclic analogues of α-MSH and has since been used in laboratory studies as a reference melanocortin agonist — including work on melanocortin receptor pharmacology and, in animal models, on neuroprotective signalling. It continues to appear in current literature: a 2024 animal-model study in the European Journal of Pharmacology examined MT-II alongside the ACTH(4–10) analogue Semax in a chronic-stress model, and a 2025 review in the Journal of the European Academy of Dermatology and Venereology surveyed the published record on chronic melanocortin-1-receptor activation by α-MSH analogues. Findings are reported in the primary scientific literature listed below.

What compounds is Melanotan II studied alongside?

In the melanocortin literature, Melanotan II is most closely linked to PT-141 (bremelanotide), described in the same research programme as its metabolite, and it is reviewed alongside afamelanotide (NDP-α-MSH) as a fellow synthetic α-MSH analogue acting at MC1R. Animal-model work has also tested it side by side with Semax as a fellow ACTH-derived analogue. These groupings describe how the compounds are classified in published research; they do not imply equivalence between compounds or any human-use indication.

How is Melanotan II supplied, tested and handled?

Lazarus Labs supplies Melanotan II as a lyophilised (freeze-dried) reference material, independently tested to 99%+ purity, with a batch Certificate of Analysis (COA) available. Lyophilised peptides are typically stored cold and protected from light, in line with standard laboratory practice for reference materials.