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Melanogenesis Research Guide

Melanotan-2: Mechanism, Handling & Research Guide

Also known as: MT-2, MT-II

Key Facts

Melanotan-2 is a melanogenesis research peptide (C50H69N15O9, MW 1024.19 g/mol). Cyclic heptapeptide alpha-MSH analogue for pigmentation and arousal research. It is supplied as a lyophilized powder for laboratory and in-vitro research use only — not for human consumption.

Classification Synthetic alpha-MSH analog (melanocortin agonist)
Molecular Formula C50H69N15O9
Molecular Weight 1024.19 g/mol
Research Half-Life ~1 hour in preclinical models
Form Lyophilized powder
Research Category Melanogenesis

What is Melanotan-2?

Melanotan 2 is a cyclic heptapeptide analogue of alpha-melanocyte-stimulating hormone (alpha-MSH) with the sequence Ac-Nle-c[Asp-His-D-Phe-Arg-Trp-Lys]-NH2. Its cyclic structure confers modulated metabolic stability and broad melanocortin receptor affinity, activating MC1R (pigmentation), MC3R (energy homeostasis), MC4R (sexual function and appetite), and MC5R (exocrine gland function). This multi-receptor activity profile distinguishes it from more selective melanocortin analogues and accounts for its diverse range of biological effects observed in research settings. Originally developed at the University of Arizona by Hruby and colleagues, Melanotan 2 was first characterized in studies published in the Journal of Medicinal Chemistry (1989), where its potent melanotropic activity was established. Subsequent research by Dorr et al. in Archives of Dermatological Research demonstrated concentration-dependent increases in skin pigmentation without UV exposure. Studies in Neuroscience by Wessells et al. documented that MC4R activation by Melanotan 2 produced pro-melanocortin-pathway effects in animal models, findings that later informed the development of PT-141 (Bremelanotide), which was derived directly from Melanotan 2 as a more targeted therapeutic candidate. Compared to Melanotan 1 (Afamelanotide), which is linear and MC1R-selective, Melanotan 2's cyclic structure gives it broader receptor coverage and higher potency per mole. However, this reduced selectivity means research must account for concurrent effects across multiple melanocortin pathways. Both peptides share the Nle4/D-Phe7 substitutions that distinguish them from native alpha-MSH. Lyophilized Melanotan 2 should be stored at -20°C, protected from light. Reconstitute with bacteriostatic water and store at 2-8°C, using within 4 weeks. Researchers in dermatology, sexual medicine, neuropharmacology, and melanocortin receptor biology are the primary investigators of this compound.

Melanotan-2 Research Applications

In published and preclinical research, Melanotan-2 has been studied across the following areas:

  • Melanogenesis without UV exposure
  • Nerve-injury and regeneration models
  • Arousal signaling via MC4R
  • Neurodevelopmental signaling studies

Melanotan-2 in Research: Study Context

Melanotan-2 is a synthetic analog of alpha-melanocyte-stimulating hormone studied for melanogenesis (pigmentation) research via melanocortin receptors. Research concentrations are model-specific. Reconstitute with bacteriostatic water for laboratory use only.

How Melanotan-2 Compares

Researchers frequently evaluate Melanotan-2 alongside related compounds:

Melanotan-2 — Frequently Asked Questions

Is Melanotan-2 legal to buy for research?
Melanotan-2 is sold in the United States as a research chemical for laboratory and in-vitro use only. It is not approved by the FDA for human use and is not sold for human consumption. Researchers are responsible for compliance with all applicable federal, state, and institutional regulations.
Does Melanotan-2 come with a Certificate of Analysis?
Yes. Every batch of Melanotan-2 from Elyte Peptides ships with a third-party Certificate of Analysis (COA) documenting identity and HPLC purity (≥98%), so research results can be traced to a verified lot.
What is Melanotan 2 and how does it work?
Melanotan 2 is a synthetic cyclic heptapeptide (Ac-Nle-Asp-His-D-Phe-Arg-Trp-Lys-NH2) that acts as a non-selective agonist of melanocortin receptors MC-1R through MC-5R. It was designed as a more potent and stable analogue of alpha-MSH. The cyclic structure confers modulated receptor binding and enzymatic resistance. Through MC-1R activation, it stimulates melanogenesis; through MC-3R and MC-4R, it influences sexual arousal and appetite signaling pathways.
What research has been done on Melanotan 2?
Research at the University of Arizona (published in Life Sciences) first characterized Melanotan 2's melanogenic properties. Studies showed UV-independent tanning in human volunteers. Published work in Peptides journal demonstrated penile erection in males as an MC-4R-mediated effect, leading to the development of PT-141 (bremelanotide). Additional research has explored Melanotan 2's effects on nerve regeneration, neurodevelopmental signaling, and MC-4R-mediated metabolic pathways.
How does Melanotan 2 compare to PT-141 (Bremelanotide)?
PT-141 was derived from Melanotan 2 by removing its pigmentation activity. Melanotan 2 activates all five melanocortin receptors, producing pigmentation (MC-1R), sexual arousal (MC-3R/4R), and other effects. PT-141 was engineered for greater MC-3R/4R selectivity, reducing pigmentation effects. PT-141 has FDA approval and extensive clinical data. Researchers choose Melanotan 2 when studying broad melanocortin signaling or pigmentation pathways.
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