This is a working overview of alpha-MSH, written for readers who want more than a one-paragraph summary but less than a textbook.
This page was last updated on 2026-03-28 and is reviewed periodically as new material appears.
Melanotan-2 is frequently confused with afamelanotide, a linear analogue authorised in the European Union for erythropoietic protoporphyria. The two compounds differ in chain length, ring structure and receptor selectivity, so findings for one cannot be transferred directly to the other. Published controlled human data on melanotan-2 remain sparse, and much of what circulates online derives from small studies or unpublished reports. Questions about effect size, dose-response behaviour and long-term safety therefore remain unresolved.
Melanotan-2 is a synthetic cyclic heptapeptide designed as an analogue of alpha-melanocyte-stimulating hormone. Its sequence incorporates a lactam bridge that constrains the peptide into a ring, which increases resistance to enzymatic breakdown relative to the natural hormone. Researchers at the University of Arizona synthesised the compound in the late 1980s and early 1990s while studying pigmentation pathways. It has never received marketing approval from any national medicines regulator. In the scientific literature it is usually described as a laboratory research reagent rather than a therapeutic product.
The compound emerged from research programs in the 1980s that examined analogues of alpha-melanocyte-stimulating hormone for pigmentation and photoprotection. Investigators modified the native sequence to extend activity duration and potency. A related analogue, afamelanotide, was developed within the same broad line of inquiry and eventually gained approval in certain jurisdictions for a rare light-sensitivity condition. Melanotan-2 itself did not progress through the same regulatory route and has no approved therapeutic indication.
Melanocortin receptors comprise five subtypes with distinct tissue distributions and functions. Melanotan-2 is described in the literature as a non-selective agonist that engages several of these subtypes, including MC1R, MC3R, MC4R, and MC5R. MC1R is the subtype most directly linked to melanin production in skin cells. Because the compound is not subtype-selective, its observed effects in experimental settings are generally attributed to activity across multiple receptor pathways rather than to a single target.
| Property | Value | Notes |
|---|---|---|
| Chemical class | Synthetic cyclic heptapeptide | Alpha-MSH analogue with a lactam ring |
| Molecular formula | C50H69N15O9 | Commonly cited value for the neutral peptide |
| Molecular weight | 1024.18 g/mol | Calculated for the free molecule |
| Appearance | White to off-white powder | Typically supplied as a lyophilised solid |
| Solubility | Soluble in water, DMSO and ethanol | Dissolution in pure water is often slow |
The compound was developed in the late 1980s and early 1990s by academic researchers investigating melanocortin signaling and pigmentation. Early work explored whether synthetic analogs could reproduce effects of the natural hormone under controlled conditions. The molecule never advanced through the full regulatory pathway required for approval as a medicine. From the mid-2000s onward it appeared in unregulated consumer markets, often distributed through informal channels. That gap between research origins and commercial availability shapes how the compound is discussed today.
Melanotan-2 is a synthetic peptide designed as an analog of alpha-melanocyte-stimulating hormone, a signaling molecule produced in the pituitary and skin. Its structure is a linear chain of seven amino acids that folds into a ring through an internal lactam bridge joining two side chains. The compound is sometimes written as MT-II or MEL-2 in informal and commercial contexts. It belongs to the melanocortin peptide family, a group of short signaling molecules that share a conserved core sequence recognized by melanocortin receptors.
Early published reports described melanotan-2 as a tanning agent without sun protection, which means darkening is not the same as protection against ultraviolet radiation. Later studies explored the peptide in erectile dysfunction, hemorrhagic shock, and some skin conditions. No regulator in the United States or Europe has approved it for clinical use. Many products labelled melanotan-2 are sold without approval and their identity and purity are unverified. Its long-term safety in humans remains an open question.
Melanotan-2, also written Melanotan II, is a synthetic cyclic heptapeptide designed as an analogue of alpha-melanocyte-stimulating hormone. Its sequence is Ac-Nle-cyclo[Asp-His-D-Phe-Arg-Trp-Lys]-NH2, and the lactam bridge between the aspartate and lysine side chains constrains the peptide into a ring. This structural change increases receptor affinity and metabolic stability relative to the native hormone. The compound was created in the 1980s as a research tool for studying pigmentation biology.
alkanes (paraffins): aliphatic hydrocarbons without any double or triple bonds, i.e. just C-C, C-H single bonds alkenes (olefins): aliphatic hydrocarbons that contain one or more double bonds, i.e. di-olefins (dienes) or poly-olefins. alkynes (acetylenes): aliphatic hydrocarbons which have one or more triple bonds. The rest of the group is classified according to the functional groups present. Such compounds can be "straight-chain", branched-chain or cyclic. The degree of branching affects characteristics, such as the octane number or cetane number in petroleum chemistry. Both saturated (alicyclic) compounds and unsaturated compounds exist as cyclic derivatives. The most stable rings contain five or six carbon atoms, but large rings (macrocycles) and smaller rings are common. The smallest cycloalkane family is the three-membered cyclopropane ((CH2)3). Saturated cyclic compounds contain single bonds only, whereas aromatic rings have an alternating (or conjugated) double bond. Cycloalkanes do not contain multiple bonds, whereas the cycloalkenes and the cycloalkynes do.
Many proteins are involved in the process of cell signaling and signal transduction. Some proteins, such as insulin, are extracellular proteins that transmit a signal from the cell in which they were synthesized to other cells in distant tissues. Others are membrane proteins that act as receptors whose main function is to bind a signaling molecule and induce a biochemical response in the cell. Many receptors have a binding site exposed on the cell surface and an effector domain within the cell, which may have enzymatic activity or may undergo a conformational change detected by other proteins within the cell. Antibodies are protein components of an adaptive immune system whose main function is to bind antigens, or foreign substances in the body, and target them for destruction. Antibodies can be secreted into the extracellular environment or anchored in the membranes of specialized B cells known as plasma cells. Whereas enzymes are limited in their binding affinity for their substrates by the necessity of conducting their reaction, antibodies have no such constraints. An antibody's binding affinity to its target is extraordinarily high. Many ligand transport proteins bind particular small biomolecules and transport them to other locations in the body of a multicellular organism. These proteins must have a high binding affinity when their ligand is present in high concentrations, and release the ligand when it is present at low concentrations in the target tissues.
== Failsafes and avoiding false-positives == A pseudothrombocytopenia false-positive result may occur when automated platelet counting devices are used. As a means of double checking the results, the patient's blood sample is often examined under a microscope. If the clumping is visible and the number of platelets appears normal, pseudothrombocytopenia may be concluded. A second sample run with a different anticoagulant such as sodium citrate (blue top tube) to confirm the finding of pseudothrombocytopenia may be requested if there are doubts or concerns. Other alternative anticoagulants are sodium fluoride, CPT (trisodium citrate, pyridoxal 5′-phosphate and tris), CTAD (citrate, theophylline, adenosine, and dipyridamole), magnesium sulfate and acid-citrate-dextrose.
=== Dekarangers === The eponymous Dekarangers are members of the S.P.D.'s Earth unit who protect Earth from intergalactic criminals called Alienizers. Each of the primary members possess an SP License (SPライセンス, Esu Pī Raisensu) device, which allows them to transform via Change Mode (チェンジモード, Chenji Mōdo); communicate with each other, analyze items pertaining to a case they are working on, and summon their Deka Machines to battle Kaijuki via Phone Mode (フォンモード, Fon Mōdo); and determine a criminal's innocence in a particular crime and whether or not they can be approved for deletion via Judgement Mode (ジャッジメントモード, Jajjimento Mōdo). While transformed, they each carry a varying pair of D-Arms (ディーアームズ, Dī Āmuzu) sidearms, which can combine to form a firearm-like weapon. They also ride varying Deka Vehicles (デカビークル, Deka Bīkuru) for transportation. After undergoing further training, the primary Dekarangers gain the ability to assume S.W.A.T. Mode (スワットモード, Suwatto Mōdo), which clads them in armor that grants heat-seeking, X-ray, and night vision capabilities. They also wield high-powered D-Revolver (ディーリボルバー, Dī Riborubā) machine guns.
Sources: en.wikipedia.org
== Related odiferous compounds == Stench compounds have unpleasant odors. Some are used as odorizer or an odorant usually have an intense odor, which may be pleasant or not. They are sometimes used to confer a detectable odor to an odorless substance, like propane, natural gas, or hydrogen, as a safety measure.
In the Hh pathway, CK1δ can phosphorylate Smothened (Smo) thereby enhancing its activity. Moreover, its additional role in this signaling pathways is still controversial. In fact, on one hand CK1δ can phosphorylate Cubitus interruptus activator (CiA) thereby avoiding its proteasomal degradation, while on the other hand CK1δ-mediated phosphorylation of Ci can increase its ubiquitination and its partial proteolysis into the repressive form of Ci (CiR). In the Hpo pathway, CK1δ can phosphorylate yes-associated protein (YAP), the down-stream co-activator of Hpo-responsive gene transcription on Ser-381, which influences its proteasomal degradation. Moreover, the Hpo signaling pathway seems to be related with both, Wnt signaling. and p53 regulation In presence of Wnt ligand, CKδ/ε can phosphorylate the key Wnt-effector Dishevelled (Dvl) which inhibits the β-catenin destruction complex finally resulting in a higher stability of β-catenin. Here, YAP/Tafazzin (TAZ) can bind Dvl and reducing its CK1δ-mediated phosphorylation. Additionally, β-catenin can be retained into the cytoplasm after binding to YAP, which results in lower transcription of Wnt-responsive genes.
The story ends with the poet writing of Akkad's fate, mirroring the words of the gods' curse earlier on: Its chariot roads grew nothing but the 'wailing plant, Moreover, on its canalboat towpaths and landings, No human being walks because of the wild goats, vermin, snakes, and mountain scorpions, The plains where grew the heart-soothing plants, grew nothing but the 'reed of tears, Akkad, instead of its sweet-flowing water, there flowed bitter water, Who said "I would dwell in that" found not a good dwelling place, Who said "I would lie down in Akkad" found not a good sleeping place.
== Early life == Princess Zita of Bourbon-Parma was born at the Villa Pianore in the Italian Province of Lucca, 9 May 1892. The unusual name Zita was given to her after Zita, a popular Italian saint who had lived in Tuscany in the 13th century. She was the third daughter and fifth child of the deposed Robert I, Duke of Parma, and his second wife, Infanta Maria Antonia of Portugal, a daughter of King Miguel of Portugal and his wife Adelaide of Löwenstein-Wertheim-Rosenberg. Zita's father had lost his throne as a result of the movement for Italian unification in 1859 when he was still a child. He fathered twelve children during his first marriage to Princess Maria Pia of the Two Sicilies (six of whom were mentally disabled, and three of whom died young). Duke Robert became a widower in 1882, and two years later he married Infanta Maria Antonia of Portugal. The second marriage produced a further twelve children. Zita was the 17th among Duke Robert's 24 children. Robert moved his large family between Villa Pianore (a large property located between Pietrasanta and Viareggio) and his Schwarzau Castle in Lower Austria. It was mainly in these two residences that Zita spent her formative years. The family spent most of the year in Austria, moving to Pianore in the winter and returning in the summer. To move between them, they took a special train with sixteen coaches to accommodate the family and their belongings.
=== PCR method === PCR-based screening methodologies are in the process of development for a number of genes responsible for resistance. They speed up detection and can readily differentiate between carbapenamase genes-sometimes in a multiplex format. Costs of PCR testing are decreasing and reliability of molecular based tests relates more to gene presence and gene expression for production of the relevant carbapenamase. Nested arbitrary PCR (ARB-PCR) was used during a 2007 CRE outbreak at the University of Virginia Medical Center to identify the specific bla KPC plasmid involved in the transmission of the infection, and researchers suggest that ARB-PCR may also be used to identify other methods of CRE spread.
Sources: en.wikipedia.org
It is a synthetic cyclic heptapeptide modelled on alpha-melanocyte-stimulating hormone. A lactam bridge links two side chains, forming a ring that stabilises the molecule against proteolysis. It belongs to the broader melanocortin peptide family.
No national medicines agency has approved melanotan-2 for clinical use. Afamelanotide, a related but distinct peptide, holds a marketing authorisation in the European Union for a rare photosensitivity disorder. Melanotan-2 itself is handled as a laboratory chemical.
Its broad activity across melanocortin receptors makes it a tool for probing pigmentation, appetite and vascular signalling. Early trials recorded skin darkening and other effects that were not the original focus of the work. Those observations generated hypotheses that later studies have examined.
No. Melanotan-2 is manufactured synthetically. The naturally occurring peptide in the same family is alpha-melanocyte-stimulating hormone, which the body produces as part of normal endocrine and neural signalling.