What is Melanotan II (MT-2)?
Melanotan II — supplied by Peptora under the research designation MT-2 — is a synthetic cyclic analog of alpha-melanocyte-stimulating hormone (α-MSH), one of the body's natural melanocortin peptides. Structurally it is a cyclized, stabilized fragment of α-MSH designed to be more potent and longer-lasting than the native hormone. In pharmacology it is characterized as a non-selective melanocortin-receptor agonist, meaning it activates multiple receptors in the melanocortin family rather than a single one.
Because the melanocortin system touches pigmentation, appetite, energy balance, and neural signaling, Melanotan II is used in research as a tool compound for probing melanocortin-receptor biology. Throughout this guide the compound is referred to by its canonical research name, Melanotan II (MT-2). It is intended exclusively for laboratory research and is not a medicine, cosmetic, or tanning product.
The essentials at a glance
α-MSH analog
A synthetic, cyclized analog of alpha-melanocyte-stimulating hormone, more stable than the native peptide.
Non-selective agonist
Activates multiple melanocortin receptors, most studied at MC1R and MC4R.
Research tool compound
Used to probe pigmentation, appetite, and neural signaling in preclinical models — never for human or animal use.
99%+ verified purity
HPLC-verified and confirmed by LC-MS, with a batch-specific certificate of analysis.
Explore research-grade Melanotan II
HPLC-verified to 99%+ purity, batch-specific COA, fast U.S. shipping — for laboratory research use only.
View Melanotan II (MT-2)The melanocortin system: how MT-2 is studied
The melanocortin system is a family of five G-protein-coupled receptors (MC1R–MC5R) activated by peptides derived from proopiomelanocortin (POMC), including α-MSH. Melanotan II is studied as a broad agonist across several of these receptors, which is why it appears in research spanning multiple physiological areas:
- MC1R — associated in research with melanocyte biology and pigmentation pathways.
- MC3R and MC4R — receptors studied for their role in appetite, satiety, and energy homeostasis, largely in the hypothalamus and reward circuits.
- Broader melanocortin signaling — evaluated in preclinical models of nerve regeneration, neuroprotection, and central nervous-system behavior.
According to PubMed, preclinical studies have evaluated Melanotan II across several of these axes: as a melanocortin agonist that reduced food intake when microinjected into the nucleus accumbens of mice, as a compound that increased insulin sensitivity in a rat model, and as an α-MSH analog with reported neurotrophic and neuroprotective properties in a rat sciatic-nerve model. These are mechanistic, model-system findings — not clinical conclusions.
What the research explores
In laboratory settings, Melanotan II is most often studied as a probe for melanocortin-receptor pharmacology across a handful of interconnected areas:
- Melanocortin-receptor pharmacology — binding, selectivity, and structure-activity relationships, including work using MT-2 as a template to design more receptor-selective analogs.
- Appetite and energy balance — MC3R/MC4R-mediated food-intake and satiety signaling in rodent models.
- Pigmentation biology — MC1R activity in melanocyte research models.
- Neuroscience models — nerve regeneration, neuroprotection, and behavioral endpoints in preclinical studies.
How MT-2 relates to other melanocortin peptides
Melanotan II is broadly non-selective across the melanocortin receptors, whereas some related research peptides are more selective. The best-known example is bremelanotide (PT-141), a melanocortin analog studied with a greater emphasis on central MC4R signaling. The table below summarizes how researchers position these tools:
| Compound | Class | Receptor emphasis | Studied in research for |
|---|---|---|---|
| Melanotan II (MT-2) | α-MSH analog | Non-selective (MC1R–MC5R) | Pigmentation, appetite, neural signaling |
| Bremelanotide (PT-141) | α-MSH analog | Central MC4R emphasis | Central melanocortin behavior models |
| α-MSH (native) | Endogenous peptide | Broad melanocortin | Reference ligand |
Peptora carries research-grade versions of several melanocortin-family compounds, including Melanotan II (MT-2) and PT-141 (Bremelanotide), each accompanied by its own batch-specific certificate of analysis. For a broader primer, see the research peptide overview.
Purity, testing, and certificates of analysis
In research, the reliability of a result depends on the identity and purity of the material behind it. Every batch of Melanotan II from Peptora is HPLC-verified to 99%+ purity, confirmed by LC-MS identity testing, and screened across a full quality-control panel before release. Each order ships with a lot-specific certificate of analysis (COA) so the material can be matched to its documentation.
Because a cyclic peptide's biology depends on its exact structure, verified identity and purity are essential for interpretable results. To understand what each figure on a report means, see the guide on certificates of analysis.
Handling Melanotan II in the laboratory
Melanotan II is supplied as a lyophilized (freeze-dried) powder. Before research use it is reconstituted with bacteriostatic water, which is sold separately. Careful handling preserves peptide integrity and the validity of downstream work:
- 1Allow the sealed vial to reach room temperature before opening.
- 2Add bacteriostatic water slowly against the vial wall; swirl gently and do not shake.
- 3Let the powder dissolve fully before drawing.
- 4Store the reconstituted solution refrigerated and protected from light.
Full step-by-step protocols live in the reconstitution guide. Following them consistently is one of the simplest ways to keep research reproducible.
Scientific references
Melanotan II has been studied primarily in preclinical (animal and cell-based) research as a tool compound for melanocortin-receptor pharmacology. The literature below is provided for educational context, per PubMed, and describes model-system research on the compound — not the laboratory research product supplied by Peptora.
- 1Eliason NL, et al. Melanocortin receptor agonist melanotan-II microinjected in the nucleus accumbens decreases appetitive and consumptive responding for food. Neuropeptides. 2022;96:102289. doi:10.1016/j.npep.2022.102289.
- 2Tomassi S, et al. CLIPSing Melanotan-II to Discover Multiple Functionally Selective hMCR Agonists. J Med Chem. 2022;65(5):4007-4017. doi:10.1021/acs.jmedchem.1c01848.
- 3McMillan TR, et al. Melanotan II, a melanocortin agonist, partially rescues the impaired thermogenic capacity of PACAP-deficient mice. Exp Physiol. 2021;106(2):427-437. doi:10.1113/EP088838.
- 4Ter Laak MP, et al. The potent melanocortin receptor agonist melanotan-II promotes peripheral nerve regeneration and has neuroprotective properties in the rat. Eur J Pharmacol. 2003;462(1-3):179-183. doi:10.1016/s0014-2999(02)02945-x.
- 5Banno R, et al. The melanocortin agonist melanotan II increases insulin sensitivity in OLETF rats. Peptides. 2004;25(8):1279-1286. doi:10.1016/j.peptides.2004.05.007.
- 6Minakova E, et al. Melanotan-II reverses autistic features in a maternal immune activation mouse model of autism. PLoS One. 2019;14(1):e0210389. doi:10.1371/journal.pone.0210389.
Explore research-grade Melanotan II (MT-2)
HPLC-verified to 99%+ purity, batch-specific COA, fast U.S. shipping — for laboratory research use only.
View Melanotan II (MT-2)Key takeaways
- Melanotan II is Peptora's research designation MT-2 for a synthetic cyclic analog of alpha-melanocyte-stimulating hormone (α-MSH).
- It is characterized as a non-selective melanocortin-receptor agonist, most studied at MC1R and MC4R.
- Preclinical studies have evaluated it as a research tool across pigmentation, appetite and energy-balance, and neuroprotection models.
- Published research is reported for educational context only; MT-2 is not an approved drug, cosmetic, or tanning product, and is for laboratory research use only.
- Peptora's Melanotan II is HPLC-verified to 99%+ purity with a lot-specific certificate of analysis in every order.
Frequently asked questions
This article is intended solely as an educational summary of publicly available scientific literature. Products offered by Peptora are supplied exclusively for laboratory research purposes and are not approved for human or veterinary use. The information presented should not be interpreted as medical advice, treatment recommendations, or clinical guidance.
